diff --git a/source/blender/windowmanager/intern/wm_files.c b/source/blender/windowmanager/intern/wm_files.c
index 2e2595259ce..0f983cbd568 100644
--- a/source/blender/windowmanager/intern/wm_files.c
+++ b/source/blender/windowmanager/intern/wm_files.c
@@ -305,6 +305,7 @@ static void wm_init_userdef(bContext *C)
 	
 	/* displays with larger native pixels, like Macbook. Used to scale dpi with */
 	U.pixelsize = GHOST_GetNativePixelSize();
+	if (U.pixelsize == 0) U.pixelsize = 1;
 	BKE_userdef_state();
 }