diff --git a/src/dev-warning.ts b/src/dev-warning.ts
index 18ad7409d..2d571967a 100644
--- a/src/dev-warning.ts
+++ b/src/dev-warning.ts
@@ -36,7 +36,7 @@ export function log(type: 'error' | 'warn', message: string): void {
   }
 
   // manual opt out of warnings
-  if (typeof window !== 'undefined' && window[isDisabledFlag]) {
+  if (typeof window !== 'undefined' && window[isDisabledFlag as any]) {
     return;
   }