diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index 9150af7..d593bb2 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -67,6 +67,7 @@
 		test_search_mbyte.out \
 		test_set.out \
 		test_signs.out \
+		test_tagcase.out \
 		test_textobjects.out \
 		test_utf8.out