diff --git a/src/MiniFB_internal.h b/src/MiniFB_internal.h
index 7ba4062..384b65f 100755
--- a/src/MiniFB_internal.h
+++ b/src/MiniFB_internal.h
@@ -2,6 +2,7 @@
 
 #include "MiniFB.h"
 #include "MiniFB_enums.h"
+#include "x11/WindowData_X11.h"
 
 #define kCall(func, ...)    if(window_data && window_data->func) window_data->func((struct mfb_window *) window_data, __VA_ARGS__);
 #define kUnused(var)        (void) var;
@@ -18,7 +19,7 @@ extern "C" {
 #endif
 
     extern short int g_keycodes[512];
-    void init_keycodes(void);
+    void init_keycodes(SWindowData_X11 *window_data_x11);
     void keyboard_default(struct mfb_window *window, mfb_key key, mfb_key_mod mod, bool isPressed);
 
 #if defined(__cplusplus)