diff --git a/openstackclient/identity/v3/trust.py b/openstackclient/identity/v3/trust.py
index c8e5c4c729..5104864c79 100644
--- a/openstackclient/identity/v3/trust.py
+++ b/openstackclient/identity/v3/trust.py
@@ -144,7 +144,7 @@ class CreateTrust(show.ShowOne):
 
         # Format roles into something sensible
         roles = trust._info.pop('roles')
-        msg = ''.join([r['name'] + ' ' for r in roles])
+        msg = ' '.join(r['name'] for r in roles)
         trust._info['roles'] = msg
 
         return zip(*sorted(six.iteritems(trust._info)))
@@ -215,7 +215,7 @@ class ShowTrust(show.ShowOne):
 
         # Format roles into something sensible
         roles = trust._info.pop('roles')
-        msg = ''.join([r['name'] + ' ' for r in roles])
+        msg = ' '.join(r['name'] for r in roles)
         trust._info['roles'] = msg
 
         return zip(*sorted(six.iteritems(trust._info)))
diff --git a/openstackclient/tests/identity/v3/test_trust.py b/openstackclient/tests/identity/v3/test_trust.py
index b3fbe7f000..b90e78159b 100644
--- a/openstackclient/tests/identity/v3/test_trust.py
+++ b/openstackclient/tests/identity/v3/test_trust.py
@@ -107,7 +107,7 @@ class TestTrustCreate(TestTrust):
             identity_fakes.trust_id,
             identity_fakes.trust_impersonation,
             identity_fakes.project_id,
-            identity_fakes.role_name + ' ',
+            identity_fakes.role_name,
             identity_fakes.user_id,
             identity_fakes.user_id
         )
@@ -222,7 +222,7 @@ class TestTrustShow(TestTrust):
             identity_fakes.trust_id,
             identity_fakes.trust_impersonation,
             identity_fakes.project_id,
-            identity_fakes.role_name + ' ',
+            identity_fakes.role_name,
             identity_fakes.user_id,
             identity_fakes.user_id
         )