diff --git a/src/vs/platform/extensions/common/extensionValidator.ts b/src/vs/platform/extensions/common/extensionValidator.ts
index 94f3bcf8..e9736b22 100644
--- a/src/vs/platform/extensions/common/extensionValidator.ts
+++ b/src/vs/platform/extensions/common/extensionValidator.ts
@@ -404,8 +404,8 @@ function isVersionValid(currentVersion: string, date: ProductDate, requestedVers
 
 	if (!isValidVersion(currentVersion, date, desiredVersion)) {
 		// Void - ignore not compatible
-		// notices.push(nls.localize('versionMismatch', "Extension is not compatible with Code {0}. Extension requires: {1}.", currentVersion, requestedVersion));
-		// return false;
+		notices.push(nls.localize('versionMismatch', "Extension is not compatible with Code {0}. Extension requires: {1}.", currentVersion, requestedVersion));
+		return false;
 	}
 
 	return true;