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-rw-r--r--src/stdio/vfwprintf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stdio/vfwprintf.c b/src/stdio/vfwprintf.c
index 984ff7b7..c6400591 100644
--- a/src/stdio/vfwprintf.c
+++ b/src/stdio/vfwprintf.c
@@ -355,6 +355,7 @@ int vfwprintf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
 	}
 
 	FLOCK(f);
+	f->mode |= f->mode+1;
 	ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
 	FUNLOCK(f);
 	va_end(ap2);