diff --git a/sys/dev/firewire/fwmem.c b/sys/dev/firewire/fwmem.c
index a2e81e3c448..1674405f44f 100644
--- a/sys/dev/firewire/fwmem.c
+++ b/sys/dev/firewire/fwmem.c
@@ -309,7 +309,7 @@ fwmem_close (struct cdev *dev, int flags, int fmt, fw_proc *td)
 	if (fwmem_debug)
 		printf("%s: refcount=%d\n", __func__, fms->refcount);
 	if (fms->refcount < 1) {
-		free(dev->si_drv1, M_FW);
+		free(dev->si_drv1, M_FWMEM);
 		dev->si_drv1 = NULL;
 	}