diff --git a/packages/babel-plugin-transform-class-properties/src/index.js b/packages/babel-plugin-transform-class-properties/src/index.js
index 0fef5b90f6..4ad481877b 100644
--- a/packages/babel-plugin-transform-class-properties/src/index.js
+++ b/packages/babel-plugin-transform-class-properties/src/index.js
@@ -104,7 +104,7 @@ export default function({ types: t }, options) {
                   t.variableDeclarator(ident, propNode.key),
                 ]),
               );
-              propNode.key = ident;
+              propNode.key = t.clone(ident);
             }
 
             instanceBody.push(