diff --git a/engine/gl/gl_screen.c b/engine/gl/gl_screen.c
index 66d0c6f79..9753d0841 100644
--- a/engine/gl/gl_screen.c
+++ b/engine/gl/gl_screen.c
@@ -78,6 +78,11 @@ void GLSCR_UpdateScreen (void)
 		old2dscale = gl_2dscale.value;
 		vid.width = vid.conwidth = (glwidth - 320) * gl_2dscale.value + 320;
 		vid.height = vid.conheight = (glheight - 240) * gl_2dscale.value + 240;
+//pretect against too small resolutions (possibly minimising task switches).
+		if (vid.width<320)
+			vid.width=320;
+		if (vid.height<200)
+			vid.height=200;
 
 		vid.recalc_refdef = true;
 		Con_CheckResize();