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-rw-r--r--libio/iovsprintf.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/libio/iovsprintf.c b/libio/iovsprintf.c
index 2c5d77503d..916804f63d 100644
--- a/libio/iovsprintf.c
+++ b/libio/iovsprintf.c
@@ -32,7 +32,10 @@ _IO_vsprintf (string, format, args)
       _IO_va_list args;
 {
   _IO_strfile sf;
+  _IO_lock_t lock;
   int ret;
+
+  sf._f._lock = &lock;
   _IO_init ((_IO_FILE *) &sf, 0);
   _IO_JUMPS ((_IO_FILE *) &sf) = &_IO_str_jumps;
   _IO_str_init_static ((_IO_FILE *) &sf, string, -1, string);