diff --git a/packager/src/ModuleGraph/output/as-plain-bundle.js b/packager/src/ModuleGraph/output/as-plain-bundle.js
index b2a2427c8..9c1bf99ec 100644
--- a/packager/src/ModuleGraph/output/as-plain-bundle.js
+++ b/packager/src/ModuleGraph/output/as-plain-bundle.js
@@ -45,7 +45,7 @@ function asPlainBundle({
   }
 
   if (sourceMapPath) {
-    code += `/*# sourceMappingURL=${sourceMapPath}*/`;
+    code += `//# sourceMappingURL=${sourceMapPath}`;
   }
 
   return {