diff --git a/common/types.h b/common/types.h
index 9064b67e0..2e1b5d3f3 100644
--- a/common/types.h
+++ b/common/types.h
@@ -83,4 +83,20 @@ typedef const char Const_char;	//for perl XS
 #define DLLFUNC extern "C"
 #endif
 
+// htonll and ntohll already defined on windows
+#ifndef WIN32
+#	if defined(__linux__)
+#		include <endian.h>
+#	elif defined(__FreeBSD__) || defined(__NetBSD__)
+#		include <sys/endian.h>
+#	elif defined (__OpenBSD__)
+#		include <sys/types.h>
+#		define be16toh(x) betoh16(x)
+#		define be32toh(x) betoh32(x)
+#		define be64toh(x) betoh64(x)
+#	endif
+#	define htonll(x) htobe64(x)
+#	define ntohll(x) be64toh(x)
+#endif
+
 #endif