diff --git a/kas/repos.py b/kas/repos.py
index 5d3c058b..55882f35 100644
--- a/kas/repos.py
+++ b/kas/repos.py
@@ -287,7 +287,7 @@ def get_root_path(path, fallback=True):
         """
         git_cmd = ['git', 'rev-parse', '--show-toplevel',
                    '--show-superproject-working-tree']
-        (ret, output) = run_cmd(git_cmd, cwd=path, fail=False)
+        (ret, output) = run_cmd(git_cmd, cwd=path, env=os.environ, fail=False)
         if ret == 0:
             return sorted(output.strip().split('\n'))[0]