diff --git a/packages/haul-ram-bundle-webpack-plugin/src/IndexRamBundle.ts b/packages/haul-ram-bundle-webpack-plugin/src/IndexRamBundle.ts
index 06b0420d..4a9c6a8c 100644
--- a/packages/haul-ram-bundle-webpack-plugin/src/IndexRamBundle.ts
+++ b/packages/haul-ram-bundle-webpack-plugin/src/IndexRamBundle.ts
@@ -114,11 +114,10 @@ export default class IndexRamBundle {
         });
 
         lineOffset += countLines(sourceModule.source);
-
-        compilation.assets[sourceMapFilename] = new RawSource(
-          JSON.stringify(indexMap)
-        );
       });
+      compilation.assets[sourceMapFilename] = new RawSource(
+        JSON.stringify(indexMap)
+      );
     }
   }
 }