diff --git a/src/xcb_xlib.c b/src/xcb_xlib.c
index f352ca2..59f972c 100644
--- a/src/xcb_xlib.c
+++ b/src/xcb_xlib.c
@@ -35,13 +35,6 @@ unsigned int xcb_get_request_sent(xcb_connection_t *c)
     return c->out.request;
 }
 
-pthread_mutex_t *xcb_get_io_lock(xcb_connection_t *c)
-{
-    if(c->has_error)
-        return 0;
-    return &c->iolock;
-}
-
 void xcb_xlib_lock(xcb_connection_t *c)
 {
     _xcb_lock_io(c);
diff --git a/src/xcbxlib.h b/src/xcbxlib.h
index da4a044..628d71d 100644
--- a/src/xcbxlib.h
+++ b/src/xcbxlib.h
@@ -34,8 +34,6 @@
 /* This function must be called with the IOLock held. */
 unsigned int xcb_get_request_sent(xcb_connection_t *c);
 
-pthread_mutex_t *xcb_get_io_lock(xcb_connection_t *c);
-
 void xcb_xlib_lock(xcb_connection_t *c);
 void xcb_xlib_unlock(xcb_connection_t *c);