diff --git a/keystoneclient/common/cms.py b/keystoneclient/common/cms.py
index 3cca85c92..f08dbe4b2 100644
--- a/keystoneclient/common/cms.py
+++ b/keystoneclient/common/cms.py
@@ -41,7 +41,7 @@ def cms_verify(formatted, signing_cert_file_name, ca_file_name):
     output, err = process.communicate(formatted)
     retcode = process.poll()
     if retcode:
-        LOG.error('Verify error: %s' % err)
+        LOG.warning('Verify error: %s' % err)
         # NOTE(dmllr): Python 2.6 compatibility:
         # CalledProcessError did not have output keyword argument
         e = subprocess.CalledProcessError(retcode, "openssl")