diff --git a/packages/theme/package.json b/packages/theme/package.json
index a23c87c13d..fe272bcf1c 100644
--- a/packages/theme/package.json
+++ b/packages/theme/package.json
@@ -19,7 +19,8 @@
   },
   "license": "Apache-2.0",
   "sideEffects": [
-    "./src/unified/MuiClassNameSetup.ts"
+    "./src/unified/MuiClassNameSetup.ts",
+    "./dist/MuiClassNameSetup.*"
   ],
   "exports": {
     ".": "./src/index.ts",