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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 3100853ab4..812424aff9 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -2,6 +2,8 @@
# include <ctype/ctype.h>
+extern int __isctype (int __c, int __mask);
+
# ifndef NOT_IN_libc
/* The optimized macros are not defined for users because they can't see