diff --git a/configure.ac b/configure.ac
index 7c50e9d..eb77fcb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -149,15 +149,15 @@ AS_IF([test "x$WITH_PCRE" == "xyes"], [
 ####
 AC_ARG_ENABLE([ipv6],
     AS_HELP_STRING([--enable-ipv6], [Enable IPv6 Support]),
-    [AC_SUBST(WITH_IPV6, $enableval)],
-    [AC_SUBST(WITH_IPV6, no)]
+    [AC_SUBST(USE_IPV6, $enableval)],
+    [AC_SUBST(USE_IPV6, no)]
 )
 
-AS_IF([test "x$WITH_IPV6" == "xyes"], [
+AS_IF([test "x$USE_IPV6" == "xyes"], [
 	AC_CHECK_HEADER([netinet/ip6.h], [], [
 	    AC_MSG_ERROR([ You dont seem to have ipv6 support (no ip6.h found).])
 	])
-	AC_DEFINE([WITH_IPV6],[],[Compile With IPv6 support])
+	AC_DEFINE([USE_IPV6],[],[Compile With IPv6 support])
 ], [])
 
 
@@ -189,7 +189,7 @@ AC_MSG_NOTICE( ====================================================== 	)
 AC_MSG_NOTICE( OpenSSL Support              : ${WITH_OPENSSL} 			)
 AC_MSG_NOTICE( Unicode Support              : ${UNICODE}  				)
 AC_MSG_NOTICE( Perl Expressions Support     : ${WITH_PCRE}              )
-AC_MSG_NOTICE( IPv6 Support                 : ${WITH_IPV6}              )
+AC_MSG_NOTICE( IPv6 Support                 : ${USE_IPV6}               )
 AC_MSG_NOTICE( ====================================================== 	)
 AC_MSG_NOTICE
 
diff --git a/src/capture_reasm.c b/src/capture_reasm.c
index f67e8d4..efbdd34 100644
--- a/src/capture_reasm.c
+++ b/src/capture_reasm.c
@@ -34,7 +34,7 @@
 #include "util.h"
 #include "capture.h"
 #include "capture_reasm.h"
-#ifdef WITH_IPV6
+#ifdef USE_IPV6
 #include <netinet/ip6.h>
 #endif
 
@@ -47,7 +47,7 @@ capture_packet_reasm_ip(capture_info_t *capinfo, const struct pcap_pkthdr *heade
 {
     // IP header data
     struct ip *ip4;
-#ifdef WITH_IPV6
+#ifdef USE_IPV6
     // IPv6 header data
     struct ip6_hdr *ip6;
 #endif
@@ -80,7 +80,7 @@ capture_packet_reasm_ip(capture_info_t *capinfo, const struct pcap_pkthdr *heade
     // Get IP header
     ip4 = (struct ip *) (packet + capinfo->link_hl);
 
-#ifdef WITH_IPV6
+#ifdef USE_IPV6
     // Get IPv6 header
     ip6 = (struct ip6_hdr *) (packet + capinfo->link_hl);
 #endif
@@ -101,7 +101,7 @@ capture_packet_reasm_ip(capture_info_t *capinfo, const struct pcap_pkthdr *heade
             inet_ntop(AF_INET, &ip4->ip_src, ip_src, sizeof(ip_src));
             inet_ntop(AF_INET, &ip4->ip_dst, ip_dst, sizeof(ip_dst));
             break;
-#ifdef WITH_IPV6
+#ifdef USE_IPV6
         case 6:
             ip_hl = sizeof(struct ip6_hdr);
             ip_proto = ip6->ip6_nxt;
@@ -123,7 +123,7 @@ capture_packet_reasm_ip(capture_info_t *capinfo, const struct pcap_pkthdr *heade
     // Remove IP Header length from payload
     *size = *caplen - capinfo->link_hl - ip_hl;
 
-#ifdef WITH_IPV6
+#ifdef USE_IPV6
     if (ip_ver == 6)
         *size -= ntohs(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
 #endif
diff --git a/src/main.c b/src/main.c
index 3204d9e..ca812f0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -89,7 +89,7 @@ version()
 #ifdef WITH_PCRE
            " * Compiled with Perl Compatible regular expressions support.\n"
 #endif
-#ifdef WITH_IPV6
+#ifdef USE_IPV6
            " * Compiled with IPv6 support.\n"
 #endif
            "\nWritten by Ivan Alonso [aka Kaian]\n",