diff --git a/nmap.cc b/nmap.cc
index 432946b50..3dd612798 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -173,6 +173,10 @@
 #include <shlobj.h>
 #endif
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 #if HAVE_OPENSSL
 #include <openssl/opensslv.h>
 #endif
diff --git a/nmap.h b/nmap.h
index 7a0d31113..4efa0ab32 100644
--- a/nmap.h
+++ b/nmap.h
@@ -166,11 +166,6 @@
 #include <sys/param.h> /* Defines MAXHOSTNAMELEN on BSD*/
 #endif
 
-/* For systems without SCTP in netinet/in.h, such as MacOS X */
-#ifndef IPPROTO_SCTP
-#define IPPROTO_SCTP 132
-#endif
-
 /* Keep assert() defined for security reasons */
 #undef NDEBUG
 
diff --git a/nse_utility.cc b/nse_utility.cc
index b96c30cff..3c0e88abe 100644
--- a/nse_utility.cc
+++ b/nse_utility.cc
@@ -8,6 +8,10 @@
 #include "nse_main.h"
 #include "nse_utility.h"
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 int nseU_checkinteger (lua_State *L, int arg)
 {
   lua_Number n = luaL_checknumber(L, arg);
diff --git a/protocols.h b/protocols.h
index f5062243c..a4745b457 100644
--- a/protocols.h
+++ b/protocols.h
@@ -139,6 +139,10 @@
 #include <netdb.h>
 #endif
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 #define PROTOCOL_TABLE_SIZE 256
 
 struct protocol_list {
diff --git a/scan_engine.cc b/scan_engine.cc
index 98d0d28b4..f2ab64da3 100644
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -151,6 +151,10 @@
 
 #include "struct_ip.h"
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 #include <math.h>
 #include <list>
 #include <map>
diff --git a/scan_engine.h b/scan_engine.h
index 6b80027d3..607eaf888 100644
--- a/scan_engine.h
+++ b/scan_engine.h
@@ -139,6 +139,11 @@
 #include <dnet.h>
 
 #include "timing.h"
+
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 #include <pcap.h>
 #include <list>
 #include <vector>
diff --git a/scan_engine_raw.cc b/scan_engine_raw.cc
index 5559e5ec0..1ccf7eb0e 100644
--- a/scan_engine_raw.cc
+++ b/scan_engine_raw.cc
@@ -140,6 +140,10 @@
 #include "utils.h"
 #include <string>
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 extern NmapOps o;
 
 /* Pass an arp packet, including ethernet header. Must be 42bytes */
diff --git a/service_scan.cc b/service_scan.cc
index 167837e78..794fdde69 100644
--- a/service_scan.cc
+++ b/service_scan.cc
@@ -168,6 +168,10 @@
 # endif
 #endif
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 #include <algorithm>
 #include <list>
 
diff --git a/traceroute.cc b/traceroute.cc
index 0e2b466ac..604c12275 100644
--- a/traceroute.cc
+++ b/traceroute.cc
@@ -180,6 +180,10 @@ individually.
 
 #include "struct_ip.h"
 
+#ifndef IPPROTO_SCTP
+#include "libnetutil/netutil.h"
+#endif
+
 #include <dnet.h>
 
 #include <algorithm>