diff --git a/arch/ogl/gr.c b/arch/ogl/gr.c
index 96b6676a2..0065554d8 100755
--- a/arch/ogl/gr.c
+++ b/arch/ogl/gr.c
@@ -147,7 +147,7 @@ void ogl_get_verinfo(void){
 	ogl_luminance4_alpha4_ok=1;
 	ogl_rgba2_ok=1;
 	ogl_gettexlevelparam_ok=1;
-	ogl_setgammaramp_ok = 1;
+	ogl_setgammaramp_ok = 0;
 
 #ifdef __WINDOWS__
 	dglMultiTexCoord2fARB = (glMultiTexCoord2fARB_fp)wglGetProcAddress("glMultiTexCoord2fARB");
@@ -503,7 +503,7 @@ void gr_palette_clear()
 }
 
 int ogl_brightness_ok = 0;
-int ogl_setgammaramp_ok = 1;
+int ogl_setgammaramp_ok = 0;
 int ogl_brightness_r = 0, ogl_brightness_g = 0, ogl_brightness_b = 0;
 static int old_b_r = 0, old_b_g = 0, old_b_b = 0;