diff --git a/hack/jenkins/common.sh b/hack/jenkins/common.sh
index 3ca3b6d84f..ccd9216160 100755
--- a/hack/jenkins/common.sh
+++ b/hack/jenkins/common.sh
@@ -159,7 +159,7 @@ if type -P virsh; then
 fi
 
 if type -P vboxmanage; then
-  for guid in $(vboxmanage list vms | grep -Eo '\{[-a-Z0-9]+\}'); do
+  for guid in $(vboxmanage list vms | grep -Eo '\{[a-zA-Z0-9-]+\}'); do
     echo "- Removing stale VirtualBox VM: $guid"
     vboxmanage startvm "${guid}" --type emergencystop || true
     vboxmanage unregistervm "${guid}" || true