diff --git a/Modules/cstubs b/Modules/cstubs
index cf301f9..87864c6 100644
--- a/Modules/cstubs
+++ b/Modules/cstubs
@@ -808,6 +808,7 @@
 void	singlebuffer
 void	swapbuffers
 void	gsync
+void	gflush
 void	tpon
 void	tpoff
 void	clkon