diff --git a/generator/src/build.js b/generator/src/build.js
index 4694cdd7..5028a6ed 100755
--- a/generator/src/build.js
+++ b/generator/src/build.js
@@ -393,7 +393,7 @@ function elmOptimizeLevel2(outputPath, cwd) {
  */
 async function spawnElmMake(mode, options, elmEntrypointPath, outputPath, cwd) {
   await runElmMake(mode, options, elmEntrypointPath, outputPath, cwd);
-  if (!options.debug) {
+  if (mode === "optimize") {
     await elmOptimizeLevel2(outputPath, cwd);
   }
   await fsPromises.writeFile(