diff --git a/cinder/volume/drivers/ibm/flashsystem_common.py b/cinder/volume/drivers/ibm/flashsystem_common.py
index f8fa930dbf7..422b6bddc40 100644
--- a/cinder/volume/drivers/ibm/flashsystem_common.py
+++ b/cinder/volume/drivers/ibm/flashsystem_common.py
@@ -819,7 +819,7 @@ class FlashSystemDriver(san.SanDriver):
                             {'vdisk_name': vdisk_name})
                 return
             else:
-                host_name = mapping_data.keys()[0]
+                host_name = list(mapping_data.keys())[0]
         else:
             if host_name not in mapping_data:
                 LOG.error(_LE('_unmap_vdisk_from_host: No mapping of volume '
diff --git a/tests-py3.txt b/tests-py3.txt
index d7a56090e0e..b31aa6488b7 100644
--- a/tests-py3.txt
+++ b/tests-py3.txt
@@ -52,6 +52,7 @@ cinder.tests.unit.test_hp_xp_fc
 cinder.tests.unit.test_hplefthand
 cinder.tests.unit.test_huawei_drivers
 cinder.tests.unit.test_huawei_drivers_compatibility
+cinder.tests.unit.test_ibm_flashsystem
 cinder.tests.unit.test_ibm_flashsystem_iscsi
 cinder.tests.unit.test_ibm_xiv_ds8k
 cinder.tests.unit.test_ibmnas