diff --git a/arch/x86/cpu/pci.c b/arch/x86/cpu/pci.c
index fdfd5f7..f8da080 100644
--- a/arch/x86/cpu/pci.c
+++ b/arch/x86/cpu/pci.c
@@ -172,6 +172,8 @@
 			continue;
 
 		line = irq[pin - 1];
+		if (!line)
+			continue;
 
 		debug("Assigning IRQ %d to PCI device %d.%x.%d (INT%c)\n",
 		      line, bus, device, func, 'A' + pin - 1);