diff --git a/pkgs/by-name/ma/macopix/package.nix b/pkgs/by-name/ma/macopix/package.nix
index c25d32f1c0c8..c58355fd2299 100644
--- a/pkgs/by-name/ma/macopix/package.nix
+++ b/pkgs/by-name/ma/macopix/package.nix
@@ -32,12 +32,13 @@ stdenv.mkDerivation (finalAttrs: {
 
   enableParallelBuilding = true;
 
-  # Workaround build failure on -fno-common toolchains:
-  #   ld: dnd.o:src/main.h:136: multiple definition of
-  #     `MENU_EXT'; main.o:src/main.h:136: first defined here
-  env.NIX_CFLAGS_COMPILE = "-fcommon";
-
-  NIX_LDFLAGS = "-lX11";
+  env = {
+    # Workaround build failure on -fno-common toolchains:
+    #   ld: dnd.o:src/main.h:136: multiple definition of
+    #     `MENU_EXT'; main.o:src/main.h:136: first defined here
+    NIX_CFLAGS_COMPILE = "-fcommon";
+    NIX_LDFLAGS = "-lX11";
+  };
 
   nativeInstallCheckInputs = [
     versionCheckHook