diff --git a/src/kernel/config.test.c b/src/kernel/config.test.c
index 40adaa364..ac35b85a3 100644
--- a/src/kernel/config.test.c
+++ b/src/kernel/config.test.c
@@ -278,6 +278,7 @@ static void test_game_mailcmd(CuTest *tc) {
     CuAssertStrEquals(tc, "Eressea", game_name());
     CuAssertStrEquals(tc, "ERESSEA", game_mailcmd());
     config_set("game.name", "Hodor");
+    config_set("game.mailcmd", NULL);
     CuAssertStrEquals(tc, "Hodor", game_name());
     CuAssertStrEquals(tc, "HODOR", game_mailcmd());
     config_set("game.mailcmd", "ERESSEA");