diff --git a/os/client_priv.h b/os/client_priv.h
index c9c534e64..8bb0acf51 100644
--- a/os/client_priv.h
+++ b/os/client_priv.h
@@ -53,7 +53,9 @@ void NotifyParentProcess(void);
 void CreateWellKnownSockets(void);
 void ResetWellKnownSockets(void);
 void CloseWellKnownConnections(void);
-void SetCriticalOutputPending(void);
+
+// exported for nvidia driver
+_X_EXPORT void SetCriticalOutputPending(void);
 
 /* exported only for DRI module, but should not be used by external drivers */
 _X_EXPORT void ResetCurrentRequest(struct _Client *client);