2 files changed, 9 insertions, 0 deletions
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index a42a69206..4f1387ccb 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -22,6 +22,7 @@
 #include <errno.h>
 #include <string.h>
 #include <fcntl.h>
+#include <sys/lock.h>
 #include "local.h"
 
 static void
@@ -45,6 +46,9 @@ std (ptr, flags, file, data)
   ptr->_seek = __sseek;
   ptr->_close = __sclose;
   ptr->_data = data;
+#ifndef __SINGLE_THREAD__
+  __lock_init_recursive (*(_LOCK_RECURSIVE_T *)&ptr->_lock);
+#endif
 
 #ifdef __SCLE
   if (__stextmode(ptr->_file))
diff --git a/newlib/libc/stdio/fopen.c b/newlib/libc/stdio/fopen.c
index e4708785d..ff2cbec46 100644
--- a/newlib/libc/stdio/fopen.c
+++ b/newlib/libc/stdio/fopen.c
@@ -119,6 +119,7 @@ static char sccsid[] = "%W% (Berkeley) %G%";
 #ifdef __CYGWIN__
 #include <fcntl.h>
 #endif
+#include <sys/lock.h>
 
 FILE *
 _DEFUN (_fopen_r, (ptr, file, mode),
@@ -157,6 +158,10 @@ _DEFUN (_fopen_r, (ptr, file, mode),
     fp->_flags |= __SCLE;
 #endif
 
+#ifndef __SINGLE_THREAD__
+  __lock_init_recursive (*(_LOCK_RECURSIVE_T *)&fp->_lock);
+#endif
+
   return fp;
 }