diff --git a/hw/xwayland/xwayland-vidmode.c b/hw/xwayland/xwayland-vidmode.c
index 100ccb411..87e9c3d73 100644
--- a/hw/xwayland/xwayland-vidmode.c
+++ b/hw/xwayland/xwayland-vidmode.c
@@ -404,6 +404,7 @@ static Bool
 xwlVidModeGetGamma(ScreenPtr pScreen, float *red, float *green, float *blue)
 {
     /* Unsupported for now, but pretend it works */
+    *red = *green = *blue = 1.0f;
     return TRUE;
 }