diff --git a/packages/next/server/config.ts b/packages/next/server/config.ts
index 1250ea0dfe38004..2e334084a915830 100644
--- a/packages/next/server/config.ts
+++ b/packages/next/server/config.ts
@@ -67,8 +67,9 @@ function assignDefaults(userConfig: { [key: string]: any }) {
 
       if (
         key === 'experimental' &&
-        value !== undefined &&
-        value !== defaultConfig[key]
+        value !== defaultConfig[key] &&
+        typeof value === 'object' &&
+        Object.keys(value).length > 0
       ) {
         experimentalWarning()
       }