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-rw-r--r--libc/misc/regex/regex.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libc/misc/regex/regex.c b/libc/misc/regex/regex.c
index 40958ff5c..99de9fd6c 100644
--- a/libc/misc/regex/regex.c
+++ b/libc/misc/regex/regex.c
@@ -39,6 +39,7 @@
#define iswlower __iswlower
#define iswalnum __iswalnum
#define towlower __towlower
+#define towupper __towupper
#define mbsinit __mbsinit
#include <wchar.h>
#include <wctype.h>