diff --git a/lib/tests/modules.sh b/lib/tests/modules.sh
index beb191aed0c1..c86e0aeec6dc 100755
--- a/lib/tests/modules.sh
+++ b/lib/tests/modules.sh
@@ -538,12 +538,12 @@ checkConfigOutput '^1$' config.sub.specialisation.value ./extendModules-168767-i
 # Class checks, evalModules
 checkConfigOutput '^{}$' config.ok.config ./class-check.nix
 checkConfigOutput '"nixos"' config.ok.class ./class-check.nix
-checkConfigError 'The module .*/module-class-is-darwin.nix was imported into nixos instead of darwin.' config.fail.config ./class-check.nix
-checkConfigError 'The module foo.nix#darwinModules.default was imported into nixos instead of darwin.' config.fail-anon.config ./class-check.nix
+checkConfigError 'The module `.*/module-class-is-darwin.nix`.*?expects class "nixos".' config.fail.config ./class-check.nix
+checkConfigError 'The module `foo.nix#darwinModules.default`.*?expects class "nixos".' config.fail-anon.config ./class-check.nix
 
 # Class checks, submoduleWith
 checkConfigOutput '^{}$' config.sub.nixosOk ./class-check.nix
-checkConfigError 'The module .*/module-class-is-darwin.nix was imported into nixos instead of darwin.' config.sub.nixosFail.config ./class-check.nix
+checkConfigError 'The module `.*/module-class-is-darwin.nix`.*?expects class "nixos".' config.sub.nixosFail.config ./class-check.nix
 
 # submoduleWith type merge with different class
 checkConfigError 'A submoduleWith option is declared multiple times with conflicting class values "darwin" and "nixos".' config.sub.mergeFail.config ./class-check.nix