diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 9233e7f62f4740293cfcb881cd7eed683651de75..593698e11f96342da45647c80cb6b1e03eea3077 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1200,8 +1200,11 @@ int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
 	}
 
 	/* use legacy irq if allowed */
-	if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1)
+	if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1) {
+		pci_intx(dev, 1);
 		return 1;
+	}
+
 	return vecs;
 }
 EXPORT_SYMBOL(pci_alloc_irq_vectors);