diff --git a/README.md b/README.md
index b9dd9fd937..f74281f289 100644
--- a/README.md
+++ b/README.md
@@ -102,9 +102,9 @@ map embedded in a comment at the bottom.
 Compile the entire `src` directory and output it to the `lib` directory.
 
     $ 6to5 src --out-dir lib
-    
+
 Compile the entire `src` directory and output it to the one concatenated file.
-    
+
     $ 6to5 src --out-file script-compiled.js
 
 Pipe a file in via stdin and output it to `script-compiled.js`
@@ -283,6 +283,23 @@ If you're inheriting from a class then static properties are inherited from it
 via [\_\_proto\_\_](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto),
 this is widely supported but you may run into problems with much older browsers.
 
+**NOTE:** `__proto__` is not supported on IE <= 9 so static properties
+**will not** be inherited. A possible workaround is to use `super();`:
+
+```javascript
+class Foo {
+  static foo() {
+
+  }
+}
+
+class Bar extends Foo {
+  static foo() {
+    super();
+  }
+}
+```
+
 ### Generators
 
 The [regenerator runtime](https://github.com/facebook/regenerator/blob/master/runtime.js)
diff --git a/lib/6to5/templates/class-props.js b/lib/6to5/templates/class-props.js
new file mode 100644
index 0000000000..2838803875
--- /dev/null
+++ b/lib/6to5/templates/class-props.js
@@ -0,0 +1,4 @@
+(function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+})
diff --git a/lib/6to5/transformers/classes.js b/lib/6to5/transformers/classes.js
index b1b90b37ff..6f17d417d3 100644
--- a/lib/6to5/transformers/classes.js
+++ b/lib/6to5/transformers/classes.js
@@ -107,16 +107,28 @@ var buildClassBody = function (file, construct, body, className, superName, node
     }, true));
   }
 
+  var instanceProps;
+  var staticProps;
+
   if (!_.isEmpty(instanceMutatorMap)) {
     var protoId = util.template("prototype-identifier", {
       CLASS_NAME: className
     });
 
-    body.push(util.buildDefineProperties(instanceMutatorMap, protoId));
+    instanceProps = util.buildDefineProperties(instanceMutatorMap, protoId);
   }
 
   if (!_.isEmpty(staticMutatorMap)) {
-    body.push(util.buildDefineProperties(staticMutatorMap, className));
+    staticProps = util.buildDefineProperties(staticMutatorMap, className);
+  }
+
+  if (instanceProps || staticProps) {
+    instanceProps = instanceProps || b.literal(null);
+    staticProps = staticProps || b.literal(null);
+
+    body.push(b.expressionStatement(
+      b.callExpression(file.addDeclaration("class-props"), [className, staticProps, instanceProps])
+    ));
   }
 };
 
diff --git a/lib/6to5/transformers/property-method-assignment.js b/lib/6to5/transformers/property-method-assignment.js
index b6e77f23fb..5fbc5dac48 100644
--- a/lib/6to5/transformers/property-method-assignment.js
+++ b/lib/6to5/transformers/property-method-assignment.js
@@ -24,6 +24,9 @@ exports.ObjectExpression = function (node, parent, file) {
   return util.template("object-define-properties-closure", {
     KEY: objId,
     OBJECT: node,
-    CONTENT: util.buildDefineProperties(mutatorMap, objId).expression
+    CONTENT: util.template("object-define-properties", {
+      OBJECT: objId,
+      PROPS:  util.buildDefineProperties(mutatorMap)
+    })
   });
 };
diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index 7c35633cf1..49faad6ce7 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -100,7 +100,7 @@ exports.pushMutatorMap = function (mutatorMap, key, kind, method) {
   }
 };
 
-exports.buildDefineProperties = function (mutatorMap, keyNode) {
+exports.buildDefineProperties = function (mutatorMap) {
   var objExpr = b.objectExpression([]);
 
   _.each(mutatorMap, function (map, key) {
@@ -117,10 +117,7 @@ exports.buildDefineProperties = function (mutatorMap, keyNode) {
     objExpr.properties.push(propNode);
   });
 
-  return exports.template("object-define-properties", {
-    OBJECT: keyNode,
-    PROPS: objExpr
-  }, true);
+  return objExpr;
 };
 
 exports.template = function (name, nodes, keepExpression) {
diff --git a/test/fixtures/transformation/classes/accessing-super-class/expected.js b/test/fixtures/transformation/classes/accessing-super-class/expected.js
index f9fa968043..95530b559d 100644
--- a/test/fixtures/transformation/classes/accessing-super-class/expected.js
+++ b/test/fixtures/transformation/classes/accessing-super-class/expected.js
@@ -1,5 +1,12 @@
 "use strict";
+
 var _slice = Array.prototype.slice;
+
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var _extends = function (child, parent) {
   child.prototype = Object.create(parent.prototype, {
     constructor: {
@@ -27,7 +34,17 @@ var Test = function(Foo) {
 
   _extends(Test, Foo);
 
-  Object.defineProperties(Test.prototype, {
+  _classProps(Test, {
+    foo: {
+      writable: true,
+
+      value: function() {
+        Foo.foo.call(this);
+        Foo.foo.call.apply(Foo.foo, [this].concat(_slice.call(arguments)));
+        Foo.foo.call.apply(Foo.foo, [this, "test"].concat(_slice.call(arguments)));
+      }
+    }
+  }, {
     test: {
       writable: true,
 
@@ -39,17 +56,5 @@ var Test = function(Foo) {
     }
   });
 
-  Object.defineProperties(Test, {
-    foo: {
-      writable: true,
-
-      value: function() {
-        Foo.foo.call(this);
-        Foo.foo.call.apply(Foo.foo, [this].concat(_slice.call(arguments)));
-        Foo.foo.call.apply(Foo.foo, [this, "test"].concat(_slice.call(arguments)));
-      }
-    }
-  });
-
   return Test;
 }(Foo);
diff --git a/test/fixtures/transformation/classes/calling-super-properties/expected.js b/test/fixtures/transformation/classes/calling-super-properties/expected.js
index 5bbc5432d7..80824f88ae 100644
--- a/test/fixtures/transformation/classes/calling-super-properties/expected.js
+++ b/test/fixtures/transformation/classes/calling-super-properties/expected.js
@@ -1,5 +1,10 @@
 "use strict";
 
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var _extends = function (child, parent) {
   child.prototype = Object.create(parent.prototype, {
     constructor: {
@@ -13,7 +18,6 @@ var _extends = function (child, parent) {
   child.__proto__ = parent;
 };
 
-
 var Test = function(Foo) {
   var Test = function Test() {
     Foo.prototype.test.whatever();
@@ -22,7 +26,7 @@ var Test = function(Foo) {
 
   _extends(Test, Foo);
 
-  Object.defineProperties(Test, {
+  _classProps(Test, {
     test: {
       writable: true,
 
@@ -30,7 +34,7 @@ var Test = function(Foo) {
         return Foo.wow.call(this);
       }
     }
-  });
+  }, null);
 
   return Test;
 }(Foo);
diff --git a/test/fixtures/transformation/classes/instance-getter-and-setter/expected.js b/test/fixtures/transformation/classes/instance-getter-and-setter/expected.js
index 9a769db762..5ab8570499 100644
--- a/test/fixtures/transformation/classes/instance-getter-and-setter/expected.js
+++ b/test/fixtures/transformation/classes/instance-getter-and-setter/expected.js
@@ -1,9 +1,14 @@
 "use strict";
 
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var Test = function() {
   var Test = function Test() {};
 
-  Object.defineProperties(Test.prototype, {
+  _classProps(Test, null, {
     test: {
       get: function() {
         return 5 + 5;
@@ -16,4 +21,4 @@ var Test = function() {
   });
 
   return Test;
-}();
\ No newline at end of file
+}();
diff --git a/test/fixtures/transformation/classes/instance-getter/expected.js b/test/fixtures/transformation/classes/instance-getter/expected.js
index 079333bb38..60aaf32f08 100644
--- a/test/fixtures/transformation/classes/instance-getter/expected.js
+++ b/test/fixtures/transformation/classes/instance-getter/expected.js
@@ -1,9 +1,14 @@
 "use strict";
 
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var Test = function() {
   var Test = function Test() {};
 
-  Object.defineProperties(Test.prototype, {
+  _classProps(Test, null, {
     test: {
       get: function() {
         return 5 + 5;
@@ -12,4 +17,4 @@ var Test = function() {
   });
 
   return Test;
-}();
\ No newline at end of file
+}();
diff --git a/test/fixtures/transformation/classes/instance-method/expected.js b/test/fixtures/transformation/classes/instance-method/expected.js
index 6c969044fb..50442620fa 100644
--- a/test/fixtures/transformation/classes/instance-method/expected.js
+++ b/test/fixtures/transformation/classes/instance-method/expected.js
@@ -1,9 +1,14 @@
 "use strict";
 
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var Test = function() {
   var Test = function Test() {};
 
-  Object.defineProperties(Test.prototype, {
+  _classProps(Test, null, {
     test: {
       writable: true,
 
@@ -14,4 +19,4 @@ var Test = function() {
   });
 
   return Test;
-}();
\ No newline at end of file
+}();
diff --git a/test/fixtures/transformation/classes/instance-setter/expected.js b/test/fixtures/transformation/classes/instance-setter/expected.js
index a1e757f281..fb1e58c8eb 100644
--- a/test/fixtures/transformation/classes/instance-setter/expected.js
+++ b/test/fixtures/transformation/classes/instance-setter/expected.js
@@ -1,9 +1,14 @@
 "use strict";
 
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var Test = function() {
   var Test = function Test() {};
 
-  Object.defineProperties(Test.prototype, {
+  _classProps(Test, null, {
     test: {
       set: function(val) {
         this._test = val;
@@ -12,4 +17,4 @@ var Test = function() {
   });
 
   return Test;
-}();
\ No newline at end of file
+}();
diff --git a/test/fixtures/transformation/classes/static/expected.js b/test/fixtures/transformation/classes/static/expected.js
index 75abf10471..52724c0c1b 100644
--- a/test/fixtures/transformation/classes/static/expected.js
+++ b/test/fixtures/transformation/classes/static/expected.js
@@ -1,9 +1,14 @@
 "use strict";
 
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
+
 var A = function() {
   var A = function A() {};
 
-  Object.defineProperties(A, {
+  _classProps(A, {
     a: {
       writable: true,
       value: function() {}
@@ -13,7 +18,7 @@ var A = function() {
       get: function() {},
       set: function(b) {}
     }
-  });
+  }, null);
 
   return A;
-}();
\ No newline at end of file
+}();
diff --git a/test/fixtures/transformation/source-maps/class/expected.js b/test/fixtures/transformation/source-maps/class/expected.js
index c250bea2cb..0706f1a8d6 100644
--- a/test/fixtures/transformation/source-maps/class/expected.js
+++ b/test/fixtures/transformation/source-maps/class/expected.js
@@ -1,7 +1,11 @@
 "use strict";
+var _classProps = function (child, staticProps, instanceProps) {
+  if (staticProps) Object.defineProperties(child, staticProps);
+  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
+};
 var Test = (function () {
   var Test = function Test() {};
-  Object.defineProperties(Test.prototype, { bar: { get: function () {
+  _classProps(Test, null, { bar: { get: function () {
     throw new Error("wow");
   } } });
   return Test;
diff --git a/test/fixtures/transformation/source-maps/class/source-mappings.json b/test/fixtures/transformation/source-maps/class/source-mappings.json
index 4a222cd380..9632b0c4eb 100644
--- a/test/fixtures/transformation/source-maps/class/source-mappings.json
+++ b/test/fixtures/transformation/source-maps/class/source-mappings.json
@@ -4,7 +4,7 @@
     "column": 11
   },
   "generated": {
-    "line": 5,
+    "line": 9,
     "column": 11
   }
 }]