diff --git a/lib/make-disk-image.nix b/lib/make-disk-image.nix
index 2c0808cc..60f437d0 100644
--- a/lib/make-disk-image.nix
+++ b/lib/make-disk-image.nix
@@ -121,7 +121,7 @@ in
     {
       buildInputs = dependencies;
       inherit preVM QEMU_OPTS;
-      postVm = cfg.extraPostVM;
+      postVM = cfg.extraPostVM;
       inherit (diskoCfg) memSize;
     }
     (partitioner + installer));