1 files changed, 5 insertions, 1 deletions
diff --git a/newlib/libc/stdio/fputc.c b/newlib/libc/stdio/fputc.c
index 966a0dbf7..b945095e5 100644
--- a/newlib/libc/stdio/fputc.c
+++ b/newlib/libc/stdio/fputc.c
@@ -47,5 +47,9 @@ _DEFUN (fputc, (ch, file),
 	int ch _AND
 	FILE * file)
 {
-  return putc (ch, file);
+  int result;
+   _flockfile(file);
+  result = putc (ch, file);
+  _funlockfile(file);
+  return result;
 }