diff --git a/MacGap/Classes/Commands/Defaults.m b/MacGap/Classes/Commands/Defaults.m
index 2d49832..d109c08 100644
--- a/MacGap/Classes/Commands/Defaults.m
+++ b/MacGap/Classes/Commands/Defaults.m
@@ -11,8 +11,8 @@
 #import "Event.h"
 #import "JSON.h"
 
-typedef id (^ReturnType)();
-typedef void (^SetType)();
+typedef id (^ReturnType)(void);
+typedef void (^SetType)(void);
 
 @interface Defaults ()
 - (NSString*) addPrefix:(NSString*)key;