diff --git a/src/Makefile b/src/Makefile
index 6c236ca..80265fd 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2227,6 +2227,7 @@
 	test_regex_char_classes \
 	test_regexp_latin \
 	test_regexp_utf8 \
+	test_registers \
 	test_reltime \
 	test_retab \
 	test_ruby \