diff --git a/src/dbus.c b/src/dbus.c
index 19509a6..d835270 100644
--- a/src/dbus.c
+++ b/src/dbus.c
@@ -364,7 +364,7 @@ static DBusMessage* dbus_read_servers_ex(DBusMessage *message)
         }
 
       /* parse the IP address */
-      addr_err = parse_server(str_addr, &addr, &source_addr, &interface, NULL);
+      addr_err = parse_server(str_addr, &addr, &source_addr, (char *) &interface, NULL);
       free(str_addr);
 
       if (addr_err)
diff --git a/src/dnsmasq.h b/src/dnsmasq.h
index fe29165..c715e58 100644
--- a/src/dnsmasq.h
+++ b/src/dnsmasq.h
@@ -891,7 +891,7 @@ void safe_pipe(int *fd, int read_noblock);
 void *whine_malloc(size_t size);
 int sa_len(union mysockaddr *addr);
 int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2);
-int hostname_isequal(char *a, char *b);
+int hostname_isequal(const char *a, const char *b);
 time_t dnsmasq_time(void);
 int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask);
 #ifdef HAVE_IPV6
diff --git a/src/util.c b/src/util.c
index a1d47d6..0162930 100644
--- a/src/util.c
+++ b/src/util.c
@@ -280,7 +280,7 @@ int sa_len(union mysockaddr *addr)
 }
 
 /* don't use strcasecmp and friends here - they may be messed up by LOCALE */
-int hostname_isequal(char *a, char *b)
+int hostname_isequal(const char *a, const char *b)
 {
   unsigned int c1, c2;