diff --git a/src/Xxcbint.h b/src/Xxcbint.h
index 20a63864..4ef13d2f 100644
--- a/src/Xxcbint.h
+++ b/src/Xxcbint.h
@@ -46,6 +46,7 @@ typedef struct _X11XCBPrivate {
 int _XConnectXCB(Display *dpy, _Xconst char *display, int *screenp);
 void _XFreeX11XCBStructure(Display *dpy);
 
+_X_HIDDEN
 unsigned long _XNextRequest(Display *dpy);
 
 #endif /* XXCBINT_H */