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-rw-r--r--include/_ctype.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/_ctype.h b/include/_ctype.h
index a1fc0a2e973e..1a42952a09dc 100644
--- a/include/_ctype.h
+++ b/include/_ctype.h
@@ -72,9 +72,9 @@
/* See comments in <sys/_types.h> about __ct_rune_t. */
__BEGIN_DECLS
-unsigned long ___runetype(__ct_rune_t);
-__ct_rune_t ___tolower(__ct_rune_t);
-__ct_rune_t ___toupper(__ct_rune_t);
+unsigned long ___runetype(__ct_rune_t) __pure;
+__ct_rune_t ___tolower(__ct_rune_t) __pure;
+__ct_rune_t ___toupper(__ct_rune_t) __pure;
__END_DECLS
/*