diff --git a/src/lib/ecore_cocoa/Ecore_Cocoa.h b/src/lib/ecore_cocoa/Ecore_Cocoa.h
index 4341389ce2..84a69a87d2 100644
--- a/src/lib/ecore_cocoa/Ecore_Cocoa.h
+++ b/src/lib/ecore_cocoa/Ecore_Cocoa.h
@@ -164,7 +164,7 @@ EAPI void ecore_cocoa_window_view_set(Ecore_Cocoa_Window *window,
 
 EAPI int ecore_cocoa_titlebar_height_get(void);
 
-EAPI Ecore_Cocoa_Window_Id ecore_cocoa_window_get_window_id(Ecore_Cocoa_Window *window);
+EAPI Ecore_Cocoa_Window_Id ecore_cocoa_window_get_window_id(const Ecore_Cocoa_Window *window);
 
 
 EAPI void ecore_cocoa_window_cursor_set(Ecore_Cocoa_Window *win, Ecore_Cocoa_Cursor c);
diff --git a/src/lib/ecore_cocoa/ecore_cocoa_window.m b/src/lib/ecore_cocoa/ecore_cocoa_window.m
index de905c53ee..78c86a29b3 100644
--- a/src/lib/ecore_cocoa/ecore_cocoa_window.m
+++ b/src/lib/ecore_cocoa/ecore_cocoa_window.m
@@ -496,7 +496,8 @@ ecore_cocoa_window_view_set(Ecore_Cocoa_Window *window,
   [area release];
 }
 
-Ecore_Cocoa_Window_Id ecore_cocoa_window_get_window_id(Ecore_Cocoa_Window *window)
+EAPI Ecore_Cocoa_Window_Id
+ecore_cocoa_window_get_window_id(const Ecore_Cocoa_Window *window)
 {
   if (!window)
     return 0;