diff --git a/lib/ansible/modules/cloud/azure/azure_rm_storageaccount.py b/lib/ansible/modules/cloud/azure/azure_rm_storageaccount.py
index fb0314e157..90423870a5 100644
--- a/lib/ansible/modules/cloud/azure/azure_rm_storageaccount.py
+++ b/lib/ansible/modules/cloud/azure/azure_rm_storageaccount.py
@@ -174,7 +174,8 @@ class AzureRMStorageAccount(AzureRMModuleBase):
 
         if HAS_AZURE:
             for key in self.storage_models.SkuName:
-                self.module_arg_spec['account_type']['choices'].append(getattr(key, 'value'))
+                if getattr(key, 'value') not in self.module_arg_spec['account_type']['choices']:
+                    self.module_arg_spec['account_type']['choices'].append(getattr(key, 'value'))
 
         self.results = dict(
             changed=False,