diff --git a/pkgs/servers/x11/xorg/overrides.nix b/pkgs/servers/x11/xorg/overrides.nix
index ee7aec1663c..ae715bf33ca 100644
--- a/pkgs/servers/x11/xorg/overrides.nix
+++ b/pkgs/servers/x11/xorg/overrides.nix
@@ -174,7 +174,8 @@ in
   };
 
   xf86videoati = attrs: attrs // {
-    buildInputs = attrs.buildInputs ++ [xorg.glproto args.mesa];
+    NIX_CFLAGS_COMPILE = "-I${xorg.pixman}/include/pixman-1";
+    buildInputs = attrs.buildInputs ++ [xorg.glproto args.mesa xorg.pixman];
   };
 
   xf86videocirrus = attrs: attrs // {