diff --git a/src/bsdiff-4.3/bspatch.c b/src/bsdiff-4.3/bspatch.c
index 741d4de0e..f9d33ddd6 100644
--- a/src/bsdiff-4.3/bspatch.c
+++ b/src/bsdiff-4.3/bspatch.c
@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:
 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/types.h>
 
 static off_t offtin(u_char *buf)
 {