diff --git a/sys/dev/hme/if_hme_pci.c b/sys/dev/hme/if_hme_pci.c
index 8d778465088f..ade6e19d631b 100644
--- a/sys/dev/hme/if_hme_pci.c
+++ b/sys/dev/hme/if_hme_pci.c
@@ -377,6 +377,7 @@ hme_pci_detach(device_t dev)
 	hme_detach(sc);
 	bus_release_resource(dev, SYS_RES_IRQ, hsc->hsc_irid, hsc->hsc_ires);
 	bus_release_resource(dev, SYS_RES_MEMORY, hsc->hsc_srid, hsc->hsc_sres);
+	mtx_destroy(&sc->sc_lock);
 	return (0);
 }