diff --git a/tests/unittests/tests-dns_cache/tests-dns_cache.c b/tests/unittests/tests-dns_cache/tests-dns_cache.c
index 4aacc0acfa..a9cb326708 100644
--- a/tests/unittests/tests-dns_cache/tests-dns_cache.c
+++ b/tests/unittests/tests-dns_cache/tests-dns_cache.c
@@ -37,10 +37,25 @@ static void test_dns_cache_add(void)
     TEST_ASSERT_EQUAL_INT(0, dns_cache_query("example.com", &addr_out, AF_INET6));
 }
 
+static void test_dns_cache_add_ttl0(void)
+{
+    ipv6_addr_t addr_in = IPV6_ADDR_ALL_NODES_IF_LOCAL;
+    ipv6_addr_t addr_out;
+
+    TEST_ASSERT_EQUAL_INT(0, dns_cache_query("example.com", &addr_out, AF_INET6));
+    dns_cache_add("example.com", &addr_in, sizeof(addr_in), 0);
+    TEST_ASSERT_EQUAL_INT(0, dns_cache_query("example.com", &addr_out, AF_INET6));
+    dns_cache_add("example.com", &addr_in, sizeof(addr_in), 1);
+    TEST_ASSERT_EQUAL_INT(sizeof(addr_out), dns_cache_query("example.com", &addr_out, AF_INET6));
+    dns_cache_add("example.com", &addr_in, sizeof(addr_in), 0);
+    TEST_ASSERT_EQUAL_INT(0, dns_cache_query("example.com", &addr_out, AF_INET6));
+}
+
 Test *tests_dns_cache_tests(void)
 {
     EMB_UNIT_TESTFIXTURES(fixtures) {
         new_TestFixture(test_dns_cache_add),
+        new_TestFixture(test_dns_cache_add_ttl0),
     };
 
     EMB_UNIT_TESTCALLER(dns_cache_tests, NULL, NULL, fixtures);