1 files changed, 1 insertions, 1 deletions
diff --git a/cpukit/libcsupport/include/rtems/libio.h b/cpukit/libcsupport/include/rtems/libio.h
index f2b1c9a715..e539e95089 100644
--- a/cpukit/libcsupport/include/rtems/libio.h
+++ b/cpukit/libcsupport/include/rtems/libio.h
@@ -1598,7 +1598,7 @@ typedef struct rtems_termios_callbacks {
   int    (*firstOpen)(int major, int minor, void *arg);
   int    (*lastClose)(int major, int minor, void *arg);
   int    (*pollRead)(int minor);
-  ssize_t (*write)(int minor, const char *buf, size_t len);
+  ssize_t (*write)(int minor, const unsigned char *buf, size_t len);
   int    (*setAttributes)(int minor, const struct termios *t);
   int    (*stopRemoteTx)(int minor);
   int    (*startRemoteTx)(int minor);