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-rw-r--r--libio/memstream.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/libio/memstream.c b/libio/memstream.c
index 1a4f4b9e96..8f9c8ac92c 100644
--- a/libio/memstream.c
+++ b/libio/memstream.c
@@ -67,14 +67,18 @@ open_memstream (bufloc, sizeloc)
   struct locked_FILE
   {
     struct _IO_FILE_memstream fp;
+#ifdef _IO_MTSAFE_IO
     _IO_lock_t lock;
+#endif
   } *new_f;
   char *buf;
 
   new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
   if (new_f == NULL)
     return NULL;
+#ifdef _IO_MTSAFE_IO
   new_f->fp._sf._f._lock = &new_f->lock;
+#endif
 
   buf = ALLOC_BUF (_IO_BUFSIZ);
   _IO_init (&new_f->fp._sf._f, 0);