diff --git a/packages/next/build/webpack-config.ts b/packages/next/build/webpack-config.ts
index f030cf3139e4337..abd2b01a08296b7 100644
--- a/packages/next/build/webpack-config.ts
+++ b/packages/next/build/webpack-config.ts
@@ -1848,11 +1848,11 @@ export default async function getBaseWebpackConfig(
     }
 
     const fileNames = [
-      '/tmp/test.css',
-      '/tmp/test.scss',
-      '/tmp/test.sass',
-      '/tmp/test.less',
-      '/tmp/test.styl',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.css',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.scss',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.sass',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.less',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.styl',
     ]
 
     if (rule instanceof RegExp && fileNames.some((input) => rule.test(input))) {