diff --git a/arch/metag/include/asm/checksum.h b/arch/metag/include/asm/checksum.h
index 999bf761a732..08dd1cc65799 100644
--- a/arch/metag/include/asm/checksum.h
+++ b/arch/metag/include/asm/checksum.h
@@ -64,7 +64,8 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 					__wsum sum)
 {
 	unsigned long len_proto = (proto + len) << 8;
-	asm ("ADD    %0, %0, %1\n"
+	asm ("ADDS   %0, %0, %1\n"
+	     "ADDCS  %0, %0, #1\n"
 	     "ADDS   %0, %0, %2\n"
 	     "ADDCS  %0, %0, #1\n"
 	     "ADDS   %0, %0, %3\n"