diff --git a/src/glx/x11/drisw_glx.c b/src/glx/x11/drisw_glx.c
index 5e3d763cff5..b843ce484fb 100644
--- a/src/glx/x11/drisw_glx.c
+++ b/src/glx/x11/drisw_glx.c
@@ -405,6 +405,8 @@ driCreateScreen(__GLXscreenConfigs * psc, int screen,
    psp->createContext = driCreateContext;
    psp->createDrawable = driCreateDrawable;
    psp->swapBuffers = driSwapBuffers;
+   psp->waitX = NULL;
+   psp->waitGL = NULL;
 
    return psp;