diff --git a/lib/6to5/transformation/helpers/build-react-transformer.js b/lib/6to5/transformation/helpers/build-react-transformer.js
index 29c78bacac..85b865bf44 100644
--- a/lib/6to5/transformation/helpers/build-react-transformer.js
+++ b/lib/6to5/transformation/helpers/build-react-transformer.js
@@ -46,6 +46,11 @@ module.exports = function (exports, opts) {
   exports.JSXAttribute = {
     exit: function (node) {
       var value = node.value || t.literal(true);
+
+      if (t.isLiteral(value) && isString(value.value)) {
+        value.value = value.value.replace(/\n\s+/g, " ");
+      }
+
       return t.inherits(t.property("init", node.name, value), node);
     }
   };