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-rw-r--r--include/libc-internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/libc-internal.h b/include/libc-internal.h
index 06e55fd28..c85629042 100644
--- a/include/libc-internal.h
+++ b/include/libc-internal.h
@@ -263,6 +263,7 @@ extern char *__glibc_strerror_r_internal (int __errnum, char *__buf, size_t __bu
/* ctype.h */
extern int __tolower (int __c) __THROW attribute_hidden;
+extern int __toupper (int __c) __THROW attribute_hidden;
#ifdef __UCLIBC_HAS_WCHAR__
/* wchar.h */