diff --git a/React/CoreModules/RCTDevLoadingView.mm b/React/CoreModules/RCTDevLoadingView.mm
index fdfee9176e1696..b159dfa93b7acd 100644
--- a/React/CoreModules/RCTDevLoadingView.mm
+++ b/React/CoreModules/RCTDevLoadingView.mm
@@ -113,7 +113,7 @@ -(void)showMessage:(NSString *)message color:(UIColor *)color backgroundColor:(U
   });
 }
 
-RCT_EXPORT_METHOD(showMessage:(NSString *)message withColor:(NSNumber *)color withBackgroundColor:(NSNumber *)backgroundColor)
+RCT_EXPORT_METHOD(showMessage:(NSString *)message withColor:(NSNumber * __nonnull)color withBackgroundColor:(NSNumber * __nonnull)backgroundColor)
 {
   [self showMessage:message color:[RCTConvert UIColor:color] backgroundColor:[RCTConvert UIColor:backgroundColor]];
 }