diff --git a/regexp/_unicode_mapping.c b/regexp/_unicode_mapping.c
index 3bc8f5a58..42ad6658e 100644
--- a/regexp/_unicode_mapping.c
+++ b/regexp/_unicode_mapping.c
@@ -531,9 +531,3 @@ static const struct casemap unicode_case_mapping_lower[] = {
 	{ 0xff34, 0xff54 },	{ 0xff35, 0xff55 },	{ 0xff36, 0xff56 },	{ 0xff37, 0xff57 },
 	{ 0xff38, 0xff58 },	{ 0xff39, 0xff59 },	{ 0xff3a, 0xff5a },
 };
-
-static const struct casemap unicode_case_mapping_title[] = {
-	{ 0x01c4, 0x01c5 },	{ 0x01c5, 0x0 },	{ 0x01c6, 0x01c5 },	{ 0x01c7, 0x01c8 },
-	{ 0x01c8, 0x0 },	{ 0x01c9, 0x01c8 },	{ 0x01ca, 0x01cb },	{ 0x01cb, 0x0 },
-	{ 0x01cc, 0x01cb },	{ 0x01f1, 0x01f2 },	{ 0x01f2, 0x0 },	{ 0x01f3, 0x01f2 },
-};