diff --git a/gencode.c b/gencode.c
index b0abe00..14f4b75 100644
--- a/gencode.c
+++ b/gencode.c
@@ -31,6 +31,14 @@ static const char rcsid[] _U_ =
 #ifdef WIN32
 #include <pcap-stdinc.h>
 #else /* WIN32 */
+#if HAVE_INTTYPES_H
+#include <inttypes.h>
+#elif HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#ifdef HAVE_SYS_BITYPES_H
+#include <sys/bitypes.h>
+#endif
 #include <sys/types.h>
 #include <sys/socket.h>
 #endif /* WIN32 */