diff --git a/lib/6to5/transformation/helpers/replace-supers.js b/lib/6to5/transformation/helpers/replace-supers.js
index a09890bb4d..d4d59b056c 100644
--- a/lib/6to5/transformation/helpers/replace-supers.js
+++ b/lib/6to5/transformation/helpers/replace-supers.js
@@ -212,13 +212,13 @@ ReplaceSupers.prototype.specHandle = function (getThisReference, node, parent) {
   var args;
   var thisReference;
 
-  if (t.isIdentifier(node, { name: "super" })) {
-    if (!(t.isMemberExpression(parent) && !parent.computed && parent.property === node)) {
-      throw this.file.errorWithNode(node, "illegal use of bare super");
-    }
-  } else if (t.isCallExpression(node)) {
+  if (isIllegalBareSuper(node, parent)) {
+    throw this.file.errorWithNode(node, "Illegal use of bare super");
+  }
+
+  if (t.isCallExpression(node)) {
     var callee = node.callee;
-    if (t.isIdentifier(callee, { name: "super" })) {
+    if (isSuper(callee, node)) {
       // super(); -> _get(Object.getPrototypeOf(ClassName), "MethodName", this).call(this);
       property = methodNode.key;
       computed = methodNode.computed;
@@ -231,28 +231,19 @@ ReplaceSupers.prototype.specHandle = function (getThisReference, node, parent) {
         var methodName = methodNode.key.name || "METHOD_NAME";
         throw this.file.errorWithNode(node, "Direct super call is illegal in non-constructor, use super." + methodName + "() instead");
       }
-    } else {
-      if (!t.isMemberExpression(callee)) return;
-      if (callee.object.name !== "super") return;
-
+    } else if (t.isMemberExpression(callee) && isSuper(callee.object, callee)) {
       // super.test(); -> _get(Object.getPrototypeOf(ClassName.prototype), "test", this).call(this);
       property = callee.property;
       computed = callee.computed;
       args = node.arguments;
     }
-  } else if (t.isMemberExpression(node)) {
-    if (!t.isIdentifier(node.object, { name: "super" })) return;
-
+  } else if (t.isMemberExpression(node) && isSuper(node.object, node)) {
     // super.name; -> _get(Object.getPrototypeOf(ClassName.prototype), "name", this);
     property = node.property;
     computed = node.computed;
-  } else if (t.isAssignmentExpression(node)) {
-    if (!t.isIdentifier(node.left.object, { name: "super" })) return;
-    if (methodNode.kind !== "set") return;
-
-    thisReference = getThisReference();
+  } else if (t.isAssignmentExpression(node) && isSuper(node.left.object, node.left) && methodNode.kind === "set") {
     // super.name = "val"; -> _set(Object.getPrototypeOf(ClassName.prototype), "name", this);
-    return this.setSuperProperty(node.left.property, node.right, methodNode.static, node.left.computed, thisReference);
+    return this.setSuperProperty(node.left.property, node.right, methodNode.static, node.left.computed, getThisReference());
   }
 
   if (!property) return;
@@ -276,3 +267,14 @@ ReplaceSupers.prototype.specHandle = function (getThisReference, node, parent) {
     return superProperty;
   }
 };
+
+var isIllegalBareSuper = function (node, parent) {
+  if (!isSuper(node, parent)) return false;
+  if (t.isMemberExpression(parent, { computed: false })) return false;
+  if (t.isCallExpression(parent, { callee: node })) return false;
+  return true;
+};
+
+var isSuper = function (node, parent) {
+  return t.isIdentifier(node, { name: "super" }) && t.isReferenced(node, parent);
+};
diff --git a/test/fixtures/transformation/es6-classes/bare-super/options.json b/test/fixtures/transformation/es6-classes/bare-super/options.json
index f878b7f9cd..9813318b1b 100644
--- a/test/fixtures/transformation/es6-classes/bare-super/options.json
+++ b/test/fixtures/transformation/es6-classes/bare-super/options.json
@@ -1,3 +1,3 @@
 {
-  "throws": "illegal use of bare super"
+  "throws": "Illegal use of bare super"
 }