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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 1a54723726b1..fac85c162e8b 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -532,7 +532,7 @@ rec {
 
         rm /mnt/.debug
 
-        ${utillinux}/bin/umount /mnt/nix/store /mnt/tmp ${lib.optionalString unifiedSystemDir /mnt/proc}
+        ${utillinux}/bin/umount /mnt/nix/store /mnt/tmp ${lib.optionalString unifiedSystemDir "/mnt/proc"}
         ${utillinux}/bin/umount /mnt
       '';