diff --git a/nmap_dns.cc b/nmap_dns.cc
index c68979998..1a2e31ca4 100644
--- a/nmap_dns.cc
+++ b/nmap_dns.cc
@@ -840,7 +840,8 @@ static void add_dns_server(char *ipaddrs) {
 
   for (hostname = strtok(ipaddrs, " ,"); hostname != NULL; hostname = strtok(NULL, " ,")) {
 
-    if (resolve(hostname, 0, (struct sockaddr_storage *) &addr, &addr_len, PF_UNSPEC) != 0)
+    if (resolve(hostname, 0, (struct sockaddr_storage *) &addr, &addr_len,
+      o.spoofsource ? o.af() : PF_UNSPEC) != 0)
       continue;
 
     for(servI = servs.begin(); servI != servs.end(); servI++) {