diff --git a/src/tests/config.cpp b/src/tests/config.cpp
index 2f52467770f404611f7c563db07cc07e3e13e4ed..24776a7437a5d9d61f390b28e41d4d99a8029649 100644
--- a/src/tests/config.cpp
+++ b/src/tests/config.cpp
@@ -28,6 +28,8 @@ class ConfigTest : public CPPUNIT_NS :: TestFixture{
 	CPPUNIT_TEST(updateBackendConfig);
 	CPPUNIT_TEST(unregisteredList);
 	CPPUNIT_TEST(unregisteredString);
+	CPPUNIT_TEST(unregisteredListAsString);
+	CPPUNIT_TEST(unregisteredStringAsList);
 	CPPUNIT_TEST_SUITE_END();
 
 	public:
@@ -69,6 +71,21 @@ class ConfigTest : public CPPUNIT_NS :: TestFixture{
 		CPPUNIT_ASSERT_EQUAL(std::string("irc.freenode.org"), CONFIG_STRING(&cfg, "service.irc_server"));
 	}
 
+	void unregisteredListAsString() {
+		Config cfg;
+		std::istringstream ifs("service.irc_server = irc.freenode.orgn\nservice.irc_server = irc2.freenode.org");
+		cfg.load(ifs);
+		CPPUNIT_ASSERT_EQUAL(std::string(""), CONFIG_STRING_DEFAULTED(&cfg, "service.irc_server", ""));
+	}
+
+	void unregisteredStringAsList() {
+		Config cfg;
+		std::istringstream ifs("service.irc_server = irc.freenode.org");
+		cfg.load(ifs);
+		std::list<std::string> list;
+		CPPUNIT_ASSERT_EQUAL(0, (int) CONFIG_LIST_DEFAULTED(&cfg, "service.irc_server", list).size());
+	}
+
 };
 
 CPPUNIT_TEST_SUITE_REGISTRATION (ConfigTest);