--- a/drivers/net/wireless/rt2x00/rt2x00pci.c
+++ b/drivers/net/wireless/rt2x00/rt2x00pci.c
@@ -272,8 +272,10 @@ int rt2x00pci_probe(struct pci_dev *pci_
 
 	pci_set_master(pci_dev);
 
+#ifdef CONFIG_PCI_SET_MWI
 	if (pci_set_mwi(pci_dev))
 		ERROR_PROBE("MWI not available.\n");
+#endif
 
 	if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 		ERROR_PROBE("PCI DMA not supported.\n");
