diff --git a/src/lua_hooklib.c b/src/lua_hooklib.c
index 00237217d62afc1bf77089547f3ed1a3d253b3c4..2e17a0deabb24fe589c62b56a3fd6d6416a6ac9c 100644
--- a/src/lua_hooklib.c
+++ b/src/lua_hooklib.c
@@ -718,17 +718,17 @@ static void hook_think_frame(int type)
 	}
 }
 
-void LUA_HookPreThinkFrame()
+void LUA_HookPreThinkFrame(void)
 {
 	hook_think_frame(HOOK(PreThinkFrame));
 }
 
-void LUA_HookThinkFrame()
+void LUA_HookThinkFrame(void)
 {
 	hook_think_frame(HOOK(ThinkFrame));
 }
 
-void LUA_HookPostThinkFrame()
+void LUA_HookPostThinkFrame(void)
 {
 	hook_think_frame(HOOK(PostThinkFrame));
 }