diff --git a/packages/core/src/util/is_dev_mode.ts b/packages/core/src/util/is_dev_mode.ts
index ad8184c92272f..881ffed4c809b 100644
--- a/packages/core/src/util/is_dev_mode.ts
+++ b/packages/core/src/util/is_dev_mode.ts
@@ -49,7 +49,7 @@ export function enableProdMode(): void {
 
   // The below check is there so when ngDevMode is set via terser
   // `global['ngDevMode'] = false;` is also dropped.
-  if (typeof ngDevMode === undefined || !!ngDevMode) {
+  if (typeof ngDevMode === 'undefined' || ngDevMode) {
     global['ngDevMode'] = false;
   }