diff --git a/pkgs/development/libraries/mesa/default.nix b/pkgs/development/libraries/mesa/default.nix
index df4d1fce3c63..2f009c7a6a28 100644
--- a/pkgs/development/libraries/mesa/default.nix
+++ b/pkgs/development/libraries/mesa/default.nix
@@ -463,9 +463,12 @@ self = stdenv.mkDerivation {
     ''}
   '';
 
-  env.NIX_CFLAGS_COMPILE = toString (lib.optionals stdenv.isDarwin [ "-fno-common" ] ++ lib.optionals enableOpenCL [
-    "-UPIPE_SEARCH_DIR"
-    "-DPIPE_SEARCH_DIR=\"${placeholder "opencl"}/lib/gallium-pipe\""
+  env.NIX_CFLAGS_COMPILE = toString (
+    lib.optionals stdenv.isDarwin [
+      "-fno-common"
+    ] ++ lib.optionals enableOpenCL [
+      "-UPIPE_SEARCH_DIR"
+      "-DPIPE_SEARCH_DIR=\"${placeholder "opencl"}/lib/gallium-pipe\""
   ]);
 
   passthru = {