diff --git a/packages/non-core/coffeescript-compiler/coffeescript-compiler.js b/packages/non-core/coffeescript-compiler/coffeescript-compiler.js
index 52652d0518..283ccecce2 100644
--- a/packages/non-core/coffeescript-compiler/coffeescript-compiler.js
+++ b/packages/non-core/coffeescript-compiler/coffeescript-compiler.js
@@ -41,7 +41,7 @@ export class CoffeeScriptCompiler {
   }
 
   outputFilePath(inputFile) {
-    return inputFile.getPathInPackage() + '.js';
+    return inputFile.getPathInPackage();
   }
 
   compileOneFile(inputFile) {