diff --git a/lib/ansible/modules/cloud/vmware/vmware_guest.py b/lib/ansible/modules/cloud/vmware/vmware_guest.py
index 8d0a300747..a6f3ac5654 100644
--- a/lib/ansible/modules/cloud/vmware/vmware_guest.py
+++ b/lib/ansible/modules/cloud/vmware/vmware_guest.py
@@ -925,7 +925,7 @@ class PyVmomiHelper(object):
                 return expected * 1024 * 1024 * 1024
             elif unit == 'gb':
                 return expected * 1024 * 1024
-            elif unit == ' mb':
+            elif unit == 'mb':
                 return expected * 1024
             elif unit == 'kb':
                 return expected