diff --git a/sys/dev/usb/ehci_pci.c b/sys/dev/usb/ehci_pci.c
index 0e407d7c852..47237da6fc9 100644
--- a/sys/dev/usb/ehci_pci.c
+++ b/sys/dev/usb/ehci_pci.c
@@ -158,6 +158,8 @@ ehci_pci_attach(device_t self)
 		break;
 	}
 
+	pci_enable_busmaster(self);
+
 	rid = PCI_CBMEM;
 	sc->io_res = bus_alloc_resource(self, SYS_RES_MEMORY, &rid,
 	    0, ~0, 1, RF_ACTIVE);
diff --git a/sys/dev/usb/ohci_pci.c b/sys/dev/usb/ohci_pci.c
index e07184128f5..3d67e4f4db4 100644
--- a/sys/dev/usb/ohci_pci.c
+++ b/sys/dev/usb/ohci_pci.c
@@ -173,6 +173,8 @@ ohci_pci_attach(device_t self)
 	/* XXX where does it say so in the spec? */
 	sc->sc_bus.usbrev = USBREV_1_0;
 
+	pci_enable_busmaster(self);
+
 	rid = PCI_CBMEM;
 	sc->io_res = bus_alloc_resource(self, SYS_RES_MEMORY, &rid,
 	    0, ~0, 1, RF_ACTIVE);
diff --git a/sys/dev/usb/uhci_pci.c b/sys/dev/usb/uhci_pci.c
index c10b73d887b..1942578f608 100644
--- a/sys/dev/usb/uhci_pci.c
+++ b/sys/dev/usb/uhci_pci.c
@@ -245,6 +245,8 @@ uhci_pci_attach(device_t self)
 	int rid;
 	int err;
 
+	pci_enable_busmaster(self);
+
 	rid = PCI_UHCI_BASE_REG;
 	sc->io_res = bus_alloc_resource(self, SYS_RES_IOPORT, &rid,
 	    0, ~0, 1, RF_ACTIVE);