diff --git a/tests/testsuite.at b/tests/testsuite.at
index 6aaaa78..0093403 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -325,3 +325,9 @@
 cat $abs_srcdir/gsm23003/gsm23003_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/gsm23003/gsm23003_test], [0], [expout], [ignore])
 AT_CLEANUP
+
+AT_SETUP([tdef])
+AT_KEYWORDS([tdef])
+cat $abs_srcdir/tdef/tdef_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/tdef/tdef_test], [0], [expout], [ignore])
+AT_CLEANUP