diff --git a/source/blender/windowmanager/WM_api.h b/source/blender/windowmanager/WM_api.h
index fdf65d857fc..9722f98d535 100644
--- a/source/blender/windowmanager/WM_api.h
+++ b/source/blender/windowmanager/WM_api.h
@@ -565,8 +565,8 @@ bool WM_menutype_poll(struct bContext *C, struct MenuType *mt);
 void WM_paneltype_init(void);
 void WM_paneltype_clear(void);
 struct PanelType *WM_paneltype_find(const char *idname, bool quiet);
-bool WM_paneltype_add(struct PanelType *mt);
-void WM_paneltype_remove(struct PanelType *mt);
+bool WM_paneltype_add(struct PanelType *pt);
+void WM_paneltype_remove(struct PanelType *pt);
 
 /* wm_gesture_ops.c */
 int WM_gesture_box_invoke(struct bContext *C, struct wmOperator *op, const struct wmEvent *event);