diff --git a/engine/gl/gl_vidmacos.c b/engine/gl/gl_vidmacos.c
index 111dd8a2c..8634a0b60 100644
--- a/engine/gl/gl_vidmacos.c
+++ b/engine/gl/gl_vidmacos.c
@@ -32,6 +32,7 @@
 // note: cocoa code is separated in vid_cocoa.m because of compilation pbs
 
 cvar_t in_xflip = SCVAR("in_xflip", "0");
+extern cvar_t vid_hardwaregamma;
 
 static int real_width, real_height;