diff --git a/checks/impure/flake-module.nix b/checks/impure/flake-module.nix
index b0736fe9b..90ed57d3d 100644
--- a/checks/impure/flake-module.nix
+++ b/checks/impure/flake-module.nix
@@ -28,6 +28,12 @@
         ROOT=$(git rev-parse --show-toplevel)
         cd "$ROOT/pkgs/clan-cli"
 
+        # Set up custom git configuration for tests
+        export GIT_CONFIG_GLOBAL=$(mktemp)
+        git config --file "$GIT_CONFIG_GLOBAL" user.name "Test User"
+        git config --file "$GIT_CONFIG_GLOBAL" user.email "test@example.com"
+        export GIT_CONFIG_SYSTEM=/dev/null
+
         # this disables dynamic dependency loading in clan-cli
         export CLAN_NO_DYNAMIC_DEPS=1
 
@@ -37,6 +43,9 @@
         jobs="$((jobs > 13 ? 13 : jobs))"
 
         nix develop "$ROOT#clan-cli" -c bash -c "TMPDIR=/tmp python -m pytest -n $jobs -m impure ./clan_cli $@"
+
+        # Clean up temporary git config
+        rm -f "$GIT_CONFIG_GLOBAL"
       '';
     };
 }