diff --git a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_managedDiskController.go b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_managedDiskController.go
index c6acbf280de..178348c2949 100644
--- a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_managedDiskController.go
+++ b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_managedDiskController.go
@@ -262,7 +262,7 @@ func (c *ManagedDiskController) ResizeDisk(diskURI string, oldSize resource.Quan
 // according to https://docs.microsoft.com/en-us/rest/api/compute/disks/get
 func getResourceGroupFromDiskURI(diskURI string) (string, error) {
 	fields := strings.Split(diskURI, "/")
-	if len(fields) != 9 || fields[3] != "resourceGroups" {
+	if len(fields) != 9 || strings.ToLower(fields[3]) != "resourcegroups" {
 		return "", fmt.Errorf("invalid disk URI: %s", diskURI)
 	}
 	return fields[4], nil
diff --git a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_test.go b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_test.go
index 08a02c1585f..3438635885e 100644
--- a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_test.go
+++ b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_test.go
@@ -2705,6 +2705,12 @@ func TestGetResourceGroupFromDiskURI(t *testing.T) {
 			expectedResult: "azure-k8s1102",
 			expectError:    false,
 		},
+		{
+			// case insentive check
+			diskURL:        "/subscriptions/4be8920b-2978-43d7-axyz-04d8549c1d05/resourcegroups/azure-k8s1102/providers/Microsoft.Compute/disks/andy-mghyb1102-dynamic-pvc-f7f014c9-49f4-11e8-ab5c-000d3af7b38e",
+			expectedResult: "azure-k8s1102",
+			expectError:    false,
+		},
 		{
 			diskURL:        "/4be8920b-2978-43d7-axyz-04d8549c1d05/resourceGroups/azure-k8s1102/providers/Microsoft.Compute/disks/andy-mghyb1102-dynamic-pvc-f7f014c9-49f4-11e8-ab5c-000d3af7b38e",
 			expectedResult: "",