--- a/src/dhcp.c	
+++ a/src/dhcp.c	
@@ -3339,7 +3339,7 @@ checksums_valid(void *packet,
 	csum = 0;
 	in_cksum(&pseudo_ip, sizeof(pseudo_ip), &csum);
 	csum = in_cksum(udp, udp_len, &csum);
-	return csum == uh_sum;
+	return csum == uh_sum ? true : false;
 }
 
 static void