diff --git a/pkgs/build-support/make-darwin-bundle/default.nix b/pkgs/build-support/make-darwin-bundle/default.nix
index 60a89aa3a188..92eee48300b9 100644
--- a/pkgs/build-support/make-darwin-bundle/default.nix
+++ b/pkgs/build-support/make-darwin-bundle/default.nix
@@ -12,14 +12,16 @@
 
 writeShellScript "make-darwin-bundle-${name}" (''
   function makeDarwinBundlePhase() {
-    mkdir -p "${!outputBin}/Applications/${name}.app/Contents/MacOS"
-    mkdir -p "${!outputBin}/Applications/${name}.app/Contents/Resources"
+    mkdir -p "''${!outputBin}/Applications/${name}.app/Contents/MacOS"
+    mkdir -p "''${!outputBin}/Applications/${name}.app/Contents/Resources"
 
     if [ -n "${icon}" ]; then
-      ln -s "${icon}" "${!outputBin}/Applications/${name}.app/Contents/Resources"
+      ln -s "${icon}" \
+        "''${!outputBin}/Applications/${name}.app/Contents/Resources"
     fi
 
-    ${writeDarwinBundle}/bin/write-darwin-bundle "${!outputBin}" "${name}" "${exec}"
+    ${writeDarwinBundle}/bin/write-darwin-bundle "''${!outputBin}" "${name}" \
+      "${exec}"
   }
 
   preDistPhases+=" makeDarwinBundlePhase"