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-rw-r--r--src/stdio/open_memstream.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdio/open_memstream.c b/src/stdio/open_memstream.c
index ee834234..40f5ad60 100644
--- a/src/stdio/open_memstream.c
+++ b/src/stdio/open_memstream.c
@@ -89,6 +89,7 @@ FILE *open_memstream(char **bufp, size_t *sizep)
 	f->f.write = ms_write;
 	f->f.seek = ms_seek;
 	f->f.close = ms_close;
+	f->f.mode = -1;
 
 	if (!libc.threaded) f->f.lock = -1;