diff --git a/src/southbridge/intel/i82371eb/isa.c b/src/southbridge/intel/i82371eb/isa.c
index 7d86e8a..9d03de0 100644
--- a/src/southbridge/intel/i82371eb/isa.c
+++ b/src/southbridge/intel/i82371eb/isa.c
@@ -53,7 +53,7 @@
 	 */
 	if (CONFIG(IOAPIC)) {
 		u16 reg16;
-		u8 ioapic_id = 2;
+		const u8 ioapic_id = 2;
 
 		/* Enable IOAPIC. */
 		reg16 = pci_read_config16(dev, XBCS);