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-rw-r--r--libio/vsnprintf.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libio/vsnprintf.c b/libio/vsnprintf.c
index 38f91c9c07..174640daac 100644
--- a/libio/vsnprintf.c
+++ b/libio/vsnprintf.c
@@ -33,7 +33,9 @@ _IO_vsnprintf (string, maxlen, 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, maxlen - 1, string);