diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 68f26de..c22ce3b 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -375,6 +375,7 @@
 	test_makeencoding.res \
 	test_man.res \
 	test_maparg.res \
+	test_mapping.res \
 	test_marks.res \
 	test_matchadd_conceal.res \
 	test_memory_usage.res \