diff --git a/include/dix.h b/include/dix.h
index e40a3e64c..65e66e06c 100644
--- a/include/dix.h
+++ b/include/dix.h
@@ -147,20 +147,8 @@ extern _X_EXPORT void UpdateCurrentTime(void);
 
 extern _X_EXPORT void UpdateCurrentTimeIf(void);
 
-/*
- * @brief dereference a pixmap and destroy it when not used anymore
- *
- * Despite the name, this function unref's the pixmap, and only destroys it when
- * the pixmap isn't used anymore. (perhaps it should be renamed to dixUnrefPixmap())
- *
- * Note: it's also used as resource destructor callback, hence that strange args.
- * (not actually finest art, but for now a good compromise, since it's already
- *  existing and exported, thus can easily be used by drivers, w/o breaking compat)
- *
- * @param pPixmap pointer to pixmap (PixmapPtr) that should be unref'ed
- * @param unused ignored, only for matching the resource destructor prototype
- */
-_X_EXPORT int dixDestroyPixmap(void *pPixmap, XID unused);
+extern _X_EXPORT int dixDestroyPixmap(void *value,
+                                      XID pid);
 
 extern _X_EXPORT ClientPtr NextAvailableClient(void *ospriv);