diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 9b8770d..11cc934 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -170,6 +170,7 @@
 	    test_channel.res \
 	    test_cmdline.res \
 	    test_cscope.res \
+	    test_digraph.res \
 	    test_farsi.res \
 	    test_hardcopy.res \
 	    test_history.res \