diff --git a/arch/mips/mach-ar231x/board.c b/arch/mips/mach-ar231x/board.c
index f1b876f..8bd1787 100644
--- a/arch/mips/mach-ar231x/board.c
+++ b/arch/mips/mach-ar231x/board.c
@@ -111,7 +111,7 @@
 ar231x_cksum16(u8 *data, int size)
 {
 	int i;
-	u16 sum;
+	u16 sum = 0;
 
 	for (i = 0; i < size; i++)
 		sum += data[i];