diff --git a/nmap_dns.cc b/nmap_dns.cc
index e74fd85a2..0786ed482 100644
--- a/nmap_dns.cc
+++ b/nmap_dns.cc
@@ -947,7 +947,7 @@ static void parse_resolvdotconf() {
   }
 
   /* Customize a sscanf format to sizeof(ipaddr). */
-  Snprintf(fmt, sizeof(fmt), "nameserver %%%us", sizeof(ipaddr));
+  Snprintf(fmt, sizeof(fmt), "nameserver %%%us", (unsigned int) sizeof(ipaddr));
 
   while (fgets(buf, sizeof(buf), fp)) {
     tp = buf;
diff --git a/nmap_error.h b/nmap_error.h
index 0e93771df..add612bd3 100644
--- a/nmap_error.h
+++ b/nmap_error.h
@@ -122,10 +122,12 @@ extern "C" {
 #endif
 
 void fatal(const char *fmt, ...)
+     __attribute__ ((noreturn))
      __attribute__ ((format (printf, 1, 2)));
 void error(const char *fmt, ...)
      __attribute__ ((format (printf, 1, 2)));
 void pfatal(const char *err, ...)
+     __attribute__ ((noreturn))
      __attribute__ ((format (printf, 1, 2)));
 void gh_perror(const char *err, ...)
      __attribute__ ((format (printf, 1, 2)));