diff --git a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java
index 42d9084727e..51e3363d2c8 100644
--- a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java
+++ b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/storage/LibvirtStorageAdaptor.java
@@ -154,7 +154,7 @@ public class LibvirtStorageAdaptor implements StorageAdaptor {
             // if error is that pool is mounted, try to handle it
             if (e.toString().contains("already mounted")) {
                 s_logger.error("Attempting to unmount old mount libvirt is unaware of at "+targetPath);
-                String result = Script.runSimpleBashScript("umount " + targetPath );
+                String result = Script.runSimpleBashScript("umount -l " + targetPath );
                 if (result == null) {
                     s_logger.error("Succeeded in unmounting " + targetPath);
                     try {