diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 1885bd7..84474d9 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -170,6 +170,7 @@
 # Keep test_alot.res as the last one, sort the others.
 NEW_TESTS = test_arglist.res \
 	    test_assert.res \
+	    test_backspace_opt.res \
 	    test_cdo.res \
 	    test_channel.res \
 	    test_hardcopy.res \