diff --git a/sys/powerpc/powerpc/in_cksum.c b/sys/powerpc/powerpc/in_cksum.c
index 90f0d0295d7a..a05791fd5616 100644
--- a/sys/powerpc/powerpc/in_cksum.c
+++ b/sys/powerpc/powerpc/in_cksum.c
@@ -228,7 +228,7 @@ skip_start:
 		if (len < mlen)
 			mlen = len;
 
-		if (clen & 1)
+		if ((clen ^ (int) addr) & 1)
 		    sum += in_cksumdata(addr, mlen) << 8;
 		else
 		    sum += in_cksumdata(addr, mlen);