diff --git a/sys/amd64/vmm/vmm_dev.c b/sys/amd64/vmm/vmm_dev.c
index aa4e2780e9d..90a228c5b71 100644
--- a/sys/amd64/vmm/vmm_dev.c
+++ b/sys/amd64/vmm/vmm_dev.c
@@ -291,7 +291,7 @@ alloc_memseg(struct vmmdev_softc *sc, struct vm_memseg *mseg)
 	 */
 	if (VM_MEMSEG_NAME(mseg)) {
 		sysmem = false;
-		name = malloc(sizeof(mseg->name) M_VMMDEV, M_WAITOK);
+		name = malloc(sizeof(mseg->name), M_VMMDEV, M_WAITOK);
 		error = copystr(mseg->name, name, sizeof(mseg->name), NULL);
 		if (error)
 			goto done;