diff --git a/doomsday/engine/portable/src/gl_main.c b/doomsday/engine/portable/src/gl_main.c
index b659c8cb45..9061129190 100644
--- a/doomsday/engine/portable/src/gl_main.c
+++ b/doomsday/engine/portable/src/gl_main.c
@@ -223,7 +223,7 @@ void GL_DoUpdate(void)
 
     // Wait until the right time to show the frame so that the realized
     // frame rate is exactly right.
-    glFinish();
+    glFlush();
     DD_WaitForOptimalUpdateTime();
 
     // Blit screen to video.