diff --git a/pkgs/applications/video/mpv/default.nix b/pkgs/applications/video/mpv/default.nix
index 8624506e52e4..30a3fa8be994 100644
--- a/pkgs/applications/video/mpv/default.nix
+++ b/pkgs/applications/video/mpv/default.nix
@@ -129,6 +129,12 @@ stdenv.mkDerivation (finalAttrs: {
     ''
   ];
 
+  # Ensure we reference 'lib' (not 'out') of Swift.
+  # TODO: Remove this once the Swift wrapper doesn’t include these.
+  preConfigure = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    export SWIFT_LIB_DYNAMIC="${lib.getLib swift.swift}/lib/swift/macosx"
+  '';
+
   mesonFlags = [
     (lib.mesonOption "default_library" "shared")
     (lib.mesonBool "libmpv" true)