diff --git a/lib-src/b2m.c b/lib-src/b2m.c
index 2bf7767ec4b..f4f3888345c 100644
--- a/lib-src/b2m.c
+++ b/lib-src/b2m.c
@@ -18,6 +18,9 @@
 #include <stdio.h>
 #include <time.h>
 #include <sys/types.h>
+#ifdef MSDOS
+#include <fcntl.h>
+#endif
 
 #include <../src/config.h>
 
@@ -45,6 +48,11 @@ main (argc, argv)
      int argc;
      char **argv;
 {
+#ifdef MSDOS
+  _fmode = O_BINARY;	/* all of files are treated as binary files */
+  (stdout)->_flag &= ~_IOTEXT;
+  (stdin)->_flag &= ~_IOTEXT;
+#endif
   ltoday = time(0);
   today = ctime(&ltoday);
 
diff --git a/lib-src/etags.c b/lib-src/etags.c
index 5f7ee3437f8..423c3987d5a 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -28,6 +28,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  *	Francesco Potorti` (pot@cnuce.cnr.it) is the current maintainer. 9.8
  */
 
+#ifdef MSDOS
+#include <fcntl.h>
+#endif /* MSDOS */
+
 #ifdef HAVE_CONFIG_H
 #include <../src/config.h>
 #endif
@@ -546,6 +550,10 @@ main (argc, argv)
   extern char *massage_name ();
 #endif
 
+#ifdef MSDOS
+  _fmode = O_BINARY;	/* all of files are treated as binary files */
+#endif /* MSDOS */
+
   progname = argv[0];
 
 #ifndef CTAGS