diff --git a/Target.cc b/Target.cc
index 69d505468..121dbc00a 100644
--- a/Target.cc
+++ b/Target.cc
@@ -266,7 +266,7 @@ void Target::setSourceSockAddr(struct sockaddr_storage *ss, size_t ss_len) {
 }
 
 // Returns IPv4 host address or {0} if unavailable.
-struct in_addr Target::v4source() {
+struct in_addr Target::v4source() const {
   const struct in_addr *addy = v4sourceip();
   struct in_addr in;
   if (addy) return *addy;
@@ -275,7 +275,7 @@ struct in_addr Target::v4source() {
 }
 
 // Returns IPv4 host address or NULL if unavailable.
-const struct in_addr *Target::v4sourceip() {
+const struct in_addr *Target::v4sourceip() const {
   struct sockaddr_in *sin = (struct sockaddr_in *) &sourcesock;
   if (sin->sin_family == AF_INET) {
     return &(sin->sin_addr);
@@ -451,11 +451,11 @@ const u8 *Target::MACAddress() const {
   return (MACaddress_set)? MACaddress : NULL;
 }
 
-const u8 *Target::SrcMACAddress() {
+const u8 *Target::SrcMACAddress() const {
   return (SrcMACaddress_set)? SrcMACaddress : NULL;
 }
 
-const u8 *Target::NextHopMACAddress() {
+const u8 *Target::NextHopMACAddress() const {
   return (NextHopMACaddress_set)? NextHopMACaddress : NULL;
 }
 
diff --git a/Target.h b/Target.h
index f9c5d848e..086b99376 100644
--- a/Target.h
+++ b/Target.h
@@ -155,8 +155,8 @@ class Target {
   /* Note that it is OK to pass in a sockaddr_in or sockaddr_in6 casted
      to sockaddr_storage */
   void setSourceSockAddr(struct sockaddr_storage *ss, size_t ss_len);
-  struct in_addr v4source();
-  const struct in_addr *v4sourceip();
+  struct in_addr v4source() const;
+  const struct in_addr *v4sourceip() const;
   /* The IPv4 or IPv6 literal string for the target host */
   const char *targetipstr() { return targetipstring; }
   /* Give the name from the last setHostName() call, which should be
@@ -236,8 +236,8 @@ class Target {
 
   /* Returns a pointer to 6-byte MAC address, or NULL if none is set */
   const u8 *MACAddress() const;
-  const u8 *SrcMACAddress();
-  const u8 *NextHopMACAddress();
+  const u8 *SrcMACAddress() const;
+  const u8 *NextHopMACAddress() const;
 
 /* Set the device names so that they can be returned by deviceName()
    and deviceFullName().  The normal name may not include alias