diff --git a/pcap.c b/pcap.c
index b0cf5f0..8c5959f 100644
--- a/pcap.c
+++ b/pcap.c
@@ -43,6 +43,14 @@ 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>
 #endif /* WIN32 */