diff --git a/pkg/volume/azure_file/azure_provision.go b/pkg/volume/azure_file/azure_provision.go
index 6b4c8f834a2..1b129bbfc3c 100644
--- a/pkg/volume/azure_file/azure_provision.go
+++ b/pkg/volume/azure_file/azure_provision.go
@@ -198,10 +198,10 @@ func (a *azureFileProvisioner) Provision(selectedNode *v1.Node, allowedTopologie
 	}
 
 	if shareName == "" {
-		// File share name has a length limit of 63, and it cannot contain two consecutive '-'s.
+		// File share name has a length limit of 63, it cannot contain two consecutive '-'s, and all letters must be lower case.
 		name := util.GenerateVolumeName(a.options.ClusterName, a.options.PVName, 63)
-		shareName = strings.Replace(name, "--", "-", -1)
-	}
+		shareName = strings.ToLower(strings.Replace(name, "--", "-", -1))
+}
 
 	if resourceGroup == "" {
 		resourceGroup = a.options.PVC.ObjectMeta.Annotations[resourceGroupAnnotation]