diff --git a/panda/src/osxdisplay/osxGraphicsStateGuardian.cxx b/panda/src/osxdisplay/osxGraphicsStateGuardian.cxx
index fb8b7a6ef1..fa78069b68 100644
--- a/panda/src/osxdisplay/osxGraphicsStateGuardian.cxx
+++ b/panda/src/osxdisplay/osxGraphicsStateGuardian.cxx
@@ -413,8 +413,6 @@ static_set_gamma(float gamma) {
 			y[j] = 255;
 		};
 
-    gamma = (2 * gamma) + 1.0;
-	
 	y[0] = 256 * gamma;
 	y[1] = 256 * gamma;
 	y[2] = 256 * gamma;