diff --git a/pkgs/development/compilers/swift/compiler/default.nix b/pkgs/development/compilers/swift/compiler/default.nix
index 561b89d6f8fb..c2009a318efc 100644
--- a/pkgs/development/compilers/swift/compiler/default.nix
+++ b/pkgs/development/compilers/swift/compiler/default.nix
@@ -658,7 +658,7 @@ stdenv.mkDerivation {
     mv llvm/bin/clang-15{-unwrapped,}
     mv swift/bin/swift-frontend{-unwrapped,}
 
-    mkdir $out $lib
+    mkdir $lib
 
     # Install clang binaries only. We hide these with the wrapper, so they are
     # for private use by Swift only.