diff --git a/test/functional/configs/dkim.conf b/test/functional/configs/dkim.conf
index 9307476c1a..cc2f6f2507 100644
--- a/test/functional/configs/dkim.conf
+++ b/test/functional/configs/dkim.conf
@@ -78,4 +78,7 @@ EOD;
   trusted_only = false;
   skip_multi = false;
 }
+modules {
+    path = "${TESTDIR}/../../src/plugins/lua/"
+}
 lua = "${TESTDIR}/lua/test_coverage.lua";