diff --git a/wakelock/ios/Classes/messages.m b/wakelock/ios/Classes/messages.m
index a3246513..7338456a 100644
--- a/wakelock/ios/Classes/messages.m
+++ b/wakelock/ios/Classes/messages.m
@@ -108,7 +108,7 @@ - (FlutterStandardReader *)readerWithData:(NSData *)data {
 }
 @end
 
-NSObject<FlutterMessageCodec> *FLTWakelockApiGetCodec() {
+NSObject<FlutterMessageCodec> *FLTWakelockApiGetCodec(void) {
   static dispatch_once_t s_pred = 0;
   static FlutterStandardMessageCodec *s_sharedObject = nil;
   dispatch_once(&s_pred, ^{