1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/virtualisation/google-compute-image.nix b/nixos/modules/virtualisation/google-compute-image.nix
index 0d2d25d30752a..d172ae38fdcfa 100644
--- a/nixos/modules/virtualisation/google-compute-image.nix
+++ b/nixos/modules/virtualisation/google-compute-image.nix
@@ -51,7 +51,7 @@ in
         popd
       '';
       format = "raw";
-      configFile = if isNull cfg.configFile then defaultConfigFile else cfg.configFile;
+      configFile = if cfg.configFile == null then defaultConfigFile else cfg.configFile;
       inherit (cfg) diskSize;
       inherit config lib pkgs;
     };