--- a/libnetutil/EthernetHeader.cc
+++ b/libnetutil/EthernetHeader.cc
@@ -284,7 +284,7 @@ int EthernetHeader::setEtherType(u16 val){
 
 
 /** Returns destination port in HOST byte order */
-u16 EthernetHeader::getEtherType() const {
+const u16 EthernetHeader::getEtherType() const {
   return ntohs(this->h.eth_type);
 } /* End of getEtherType() */
 
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -166,7 +166,7 @@ extern "C" int g_has_npcap_loopback;
 #endif
 
 
-int HssPredicate::operator() (const HostScanStats *lhs, const HostScanStats *rhs) const {
+const int HssPredicate::operator() (const HostScanStats *lhs, const HostScanStats *rhs) const {
   const struct sockaddr_storage *lss, *rss;
   lss = (lhs) ? lhs->target->TargetSockAddr() : ss;
   rss = (rhs) ? rhs->target->TargetSockAddr() : ss;