diff --git a/sys/dev/altera/avgen/altera_avgen_fdt.c b/sys/dev/altera/avgen/altera_avgen_fdt.c
index 09fba3960edf..79e07eae1e53 100644
--- a/sys/dev/altera/avgen/altera_avgen_fdt.c
+++ b/sys/dev/altera/avgen/altera_avgen_fdt.c
@@ -120,11 +120,11 @@ altera_avgen_fdt_attach(device_t dev)
 		bus_release_resource(dev, SYS_RES_MEMORY, sc->avg_rid,
 		    sc->avg_res);
 	if (str_fileio != NULL)
-		free(str_fileio, M_OFWPROP);
+		OF_prop_free(str_fileio);
 	if (str_mmapio != NULL)
-		free(str_mmapio, M_OFWPROP);
+		OF_prop_free(str_mmapio);
 	if (str_devname != NULL)
-		free(str_devname, M_OFWPROP);
+		OF_prop_free(str_devname);
 	return (error);
 }
 
diff --git a/sys/dev/usb/controller/ehci_fsl.c b/sys/dev/usb/controller/ehci_fsl.c
index 7db642e780f8..a877d5ea5fd1 100644
--- a/sys/dev/usb/controller/ehci_fsl.c
+++ b/sys/dev/usb/controller/ehci_fsl.c
@@ -176,7 +176,7 @@ enable_usb(device_t dev, bus_space_tag_t iot, bus_space_handle_t ioh)
 	    (OF_getprop_alloc(node, "phy_type", 1, (void **)&phy_type) > 0)) {
 		if (strncasecmp(phy_type, "utmi", strlen("utmi")) == 0)
 			tmp |= UTMI_PHY_EN;
-		free(phy_type, M_OFWPROP);
+		OF_prop_free(phy_type);
 	}
 	bus_space_write_4(iot, ioh, CONTROL, tmp);
 }