diff --git a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_standard.go b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_standard.go
index 19366f817b0..cd6aa48cd6e 100644
--- a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_standard.go
+++ b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_standard.go
@@ -118,9 +118,9 @@ func (as *availabilitySet) DetachDisk(diskName, diskURI string, nodeName types.N
 
 	bFoundDisk := false
 	for i, disk := range disks {
-		if disk.Lun != nil && (disk.Name != nil && diskName != "" && *disk.Name == diskName) ||
-			(disk.Vhd != nil && disk.Vhd.URI != nil && diskURI != "" && *disk.Vhd.URI == diskURI) ||
-			(disk.ManagedDisk != nil && diskURI != "" && *disk.ManagedDisk.ID == diskURI) {
+		if disk.Lun != nil && (disk.Name != nil && diskName != "" && strings.EqualFold(*disk.Name, diskName)) ||
+			(disk.Vhd != nil && disk.Vhd.URI != nil && diskURI != "" && strings.EqualFold(*disk.Vhd.URI, diskURI)) ||
+			(disk.ManagedDisk != nil && diskURI != "" && strings.EqualFold(*disk.ManagedDisk.ID, diskURI)) {
 			// found the disk
 			klog.V(2).Infof("azureDisk - detach disk: name %q uri %q", diskName, diskURI)
 			disks = append(disks[:i], disks[i+1:]...)
diff --git a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_vmss.go b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_vmss.go
index 67955b3a502..4a74f1bb915 100644
--- a/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_vmss.go
+++ b/staging/src/k8s.io/legacy-cloud-providers/azure/azure_controller_vmss.go
@@ -123,9 +123,9 @@ func (ss *scaleSet) DetachDisk(diskName, diskURI string, nodeName types.NodeName
 	}
 	bFoundDisk := false
 	for i, disk := range disks {
-		if disk.Lun != nil && (disk.Name != nil && diskName != "" && *disk.Name == diskName) ||
-			(disk.Vhd != nil && disk.Vhd.URI != nil && diskURI != "" && *disk.Vhd.URI == diskURI) ||
-			(disk.ManagedDisk != nil && diskURI != "" && *disk.ManagedDisk.ID == diskURI) {
+		if disk.Lun != nil && (disk.Name != nil && diskName != "" && strings.EqualFold(*disk.Name, diskName)) ||
+			(disk.Vhd != nil && disk.Vhd.URI != nil && diskURI != "" && strings.EqualFold(*disk.Vhd.URI, diskURI)) ||
+			(disk.ManagedDisk != nil && diskURI != "" && strings.EqualFold(*disk.ManagedDisk.ID, diskURI)) {
 			// found the disk
 			klog.V(2).Infof("azureDisk - detach disk: name %q uri %q", diskName, diskURI)
 			disks = append(disks[:i], disks[i+1:]...)