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-rw-r--r--src/stdio/ungetwc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/stdio/ungetwc.c b/src/stdio/ungetwc.c
index 5282fee1..8cc85a6b 100644
--- a/src/stdio/ungetwc.c
+++ b/src/stdio/ungetwc.c
@@ -1,4 +1,8 @@
#include "stdio_impl.h"
+#include <wchar.h>
+#include <limits.h>
+#include <ctype.h>
+#include <string.h>
wint_t ungetwc(wint_t c, FILE *f)
{