diff --git a/src/vmm_mad/remotes/lib/firecracker/one-clean-firecracker-domain b/src/vmm_mad/remotes/lib/firecracker/one-clean-firecracker-domain
index 1a6706ce58..4a7f242bf7 100755
--- a/src/vmm_mad/remotes/lib/firecracker/one-clean-firecracker-domain
+++ b/src/vmm_mad/remotes/lib/firecracker/one-clean-firecracker-domain
@@ -65,7 +65,7 @@ fi
 
 # Check $VM_NAME have the right format
 regex='^one-[0-9]+$'
-if ! [[ "$VM_NAME" ~= $regex ]]; then
+if ! [[ "$VM_NAME" =~ $regex ]]; then
     exit -1
 fi