diff --git a/include/bits/wchar.h b/include/bits/wchar.h
index 6838142e81..31eb7598e8 100644
--- a/include/bits/wchar.h
+++ b/include/bits/wchar.h
@@ -27,8 +27,4 @@
 
 #define WEOF (0xffffffffu)
 
-int wprintf(const wchar_t * fmt, ...);
-int fwprintf(FILE * stream, const wchar_t * fmt, ...);
-int swprintf(wchar_t *s, size_t n, const wchar_t * fmt, ...);
-
 #endif /* _BITS_WCHAR_H */