diff --git a/test/ctype_internal_test.c b/test/ctype_internal_test.c
index 15d01e76bb77f13f821c3920786876f36655d4f6..6b66cfbaa0a0e4d25324c002cb4ae164a696ce43 100644
--- a/test/ctype_internal_test.c
+++ b/test/ctype_internal_test.c
@@ -70,7 +70,7 @@ static int test_ctype_tolower(int n)
 
 int setup_tests(void)
 {
-    ADD_ALL_TESTS(test_ctype_chars, 256);
+    ADD_ALL_TESTS(test_ctype_chars, 128);
     ADD_ALL_TESTS(test_ctype_toupper, OSSL_NELEM(case_change));
     ADD_ALL_TESTS(test_ctype_tolower, OSSL_NELEM(case_change));
     return 1;