diff --git a/src/KeyControl.cpp b/src/KeyControl.cpp
index 1a0fd699..e01abcb6 100644
--- a/src/KeyControl.cpp
+++ b/src/KeyControl.cpp
@@ -18,7 +18,7 @@ long gKeyUp = KEY_UP;
 long gKeyRight = KEY_RIGHT;
 long gKeyDown = KEY_DOWN;
 
-void GetTrg()
+void GetTrg(void)
 {
 	static int key_old;
 	gKeyTrg = gKey ^ key_old;
diff --git a/src/KeyControl.h b/src/KeyControl.h
index 535989b7..9063c82b 100644
--- a/src/KeyControl.h
+++ b/src/KeyControl.h
@@ -52,4 +52,4 @@ extern long gKeyUp;
 extern long gKeyRight;
 extern long gKeyDown;
 
-void GetTrg();
+void GetTrg(void);