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-rw-r--r--pkgs/build-support/vm/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index 84754e580302c..d63d17e23f8f8 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -406,7 +406,7 @@ rec {
       eval "$origPostHook"
     '';
 
-    origPostHook = if attrs ? postHook then attrs.postHook else "";
+    origPostHook = lib.optionalString (attrs ? postHook) attrs.postHook;
 
     /* Don't run Nix-specific build steps like patchelf. */
     fixupPhase = "true";