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-rw-r--r--libc/misc/regex/regex_old.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libc/misc/regex/regex_old.c b/libc/misc/regex/regex_old.c
index b995cabfa..9031cebff 100644
--- a/libc/misc/regex/regex_old.c
+++ b/libc/misc/regex/regex_old.c
@@ -275,7 +275,7 @@ char *realloc ();
# ifdef _tolower
# define TOLOWER(c) _tolower(c)
# else
-# define TOLOWER(c) tolower(c)
+# define TOLOWER(c) __tolower(c)
# endif
# ifndef NULL