diff --git a/icu4c/source/test/cintltst/cmsccoll.c b/icu4c/source/test/cintltst/cmsccoll.c
index ab0524e330..0abda39631 100644
--- a/icu4c/source/test/cintltst/cmsccoll.c
+++ b/icu4c/source/test/cintltst/cmsccoll.c
@@ -4151,6 +4151,7 @@ static void TestTibetanConformance(void)
     if (U_SUCCESS(status)) {
         u_unescape(test[0], source, 100);
         u_unescape(test[1], target, 100);
+        doTest(coll, source, target, UCOL_EQUAL);
         result = ucol_strcoll(coll, source, -1,   target, -1);
         printf("result %d\n", result);
         if (UCOL_EQUAL != result) {