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-rw-r--r--include/ctype.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/ctype.h b/include/ctype.h
index 21314d152..065dd5a49 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -175,9 +175,11 @@ __exctype (isxdigit);
/* Return the lowercase version of C. */
extern int tolower (int __c) __THROW;
+libc_hidden_proto(tolower)
/* Return the uppercase version of C. */
extern int toupper (int __c) __THROW;
+libc_hidden_proto(toupper)
__END_NAMESPACE_STD