diff --git a/tests/__init__.py b/tests/__init__.py
index 15a72f50..c3c37401 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -55,7 +55,8 @@ except libvirt.libvirtError:
 
 try:
     in_git = subprocess.check_output(
-        ['git', 'rev-parse', '--show-toplevel']).strip()
+        ['git', 'rev-parse', '--show-toplevel'],
+        stderr=open(os.devnull, 'w')).strip()
 except subprocess.CalledProcessError:
     # git returned nonzero, we are outside git repo
     pass