diff --git a/src/gwin/gwin_keyboard.c b/src/gwin/gwin_keyboard.c
index 7080cd5d..59befa3f 100644
--- a/src/gwin/gwin_keyboard.c
+++ b/src/gwin/gwin_keyboard.c
@@ -364,7 +364,7 @@ GSourceHandle gwinKeyboardGetEventSource(GHandle gh) {
 	return (GSourceHandle)gh;
 }
 
-void gwinKeyboardSetLayout(GHandle gh, struct GVKeyTable *layout) {
+void gwinKeyboardSetLayout(GHandle gh, const struct GVKeyTable *layout) {
 	#define gk		((GKeyboardObject *)gh)
 
 	if (gh->vmt != (gwinVMT *)&keyboardVMT)
diff --git a/src/gwin/gwin_keyboard.h b/src/gwin/gwin_keyboard.h
index 347b4bb4..a09127bd 100644
--- a/src/gwin/gwin_keyboard.h
+++ b/src/gwin/gwin_keyboard.h
@@ -101,7 +101,7 @@ GSourceHandle gwinKeyboardGetEventSource(GHandle gh);
  * @note	Changing the layout resets the keyboard to key set 0 of the keyboard and cancels any
  * 			pending shifts.
  */
-void gwinKeyboardSetLayout(GHandle gh, struct GVKeyTable *layout);
+void gwinKeyboardSetLayout(GHandle gh, const struct GVKeyTable *layout);
 
 /**
  * @defgroup Renderings_Keyboard Renderings