diff --git a/sys/dev/usb/controller/ehci_pci.c b/sys/dev/usb/controller/ehci_pci.c
index 39945d8320d..7c27873523d 100644
--- a/sys/dev/usb/controller/ehci_pci.c
+++ b/sys/dev/usb/controller/ehci_pci.c
@@ -243,7 +243,8 @@ ehci_pci_via_quirk(device_t self)
 		val = pci_read_config(self, 0x4b, 1);
 		if (val & 0x20)
 			return;
-		pci_write_config(self, 0x4b, val | 0x20, 1);
+		val |= 0x20;
+		pci_write_config(self, 0x4b, val, 1);
 		device_printf(self, "VIA-quirk applied\n");
 	}
 }