diff --git a/pkgs/applications/editors/vim/macvim.nix b/pkgs/applications/editors/vim/macvim.nix
index 64119b78709f..2005eef7b6fe 100644
--- a/pkgs/applications/editors/vim/macvim.nix
+++ b/pkgs/applications/editors/vim/macvim.nix
@@ -94,6 +94,8 @@ stdenv.mkDerivation (finalAttrs: {
       cppflags = map (drv: "-isystem ${lib.getDev drv}/include") inputs;
     in
     ''
+      unset DEVELOPER_DIR # Use the system Xcode not the nixpkgs SDK.
+
       CC=/usr/bin/clang
 
       DEV_DIR=$(/usr/bin/xcode-select -print-path)/Platforms/MacOSX.platform/Developer