diff --git a/net/net.c b/net/net.c
index 00217be..d13ae74 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1574,10 +1574,11 @@
 NetCksum(uchar * ptr, int len)
 {
 	ulong	xsum;
+	ushort *p = ptr;
 
 	xsum = 0;
 	while (len-- > 0)
-		xsum += *((ushort *)ptr)++;
+		xsum += *p++;
 	xsum = (xsum & 0xffff) + (xsum >> 16);
 	xsum = (xsum & 0xffff) + (xsum >> 16);
 	return (xsum & 0xffff);