diff --git a/src/sound/SI2.hpp b/src/sound/SI2.hpp
index 6d1b624..ec41703 100644
--- a/src/sound/SI2.hpp
+++ b/src/sound/SI2.hpp
@@ -11,7 +11,7 @@ class SI2 {
         static FrameScript_Method s_ScriptFunctions[NUM_SCRIPT_FUNCTIONS_SI2];
 
         // Static functions
-        static void RegisterScriptFunctions(void);
+        static void RegisterScriptFunctions();
 };
 
 #endif