diff --git a/src/test/test-af-list.c b/src/test/test-af-list.c
index 6934549287..2d42dc2c54 100644
--- a/src/test/test-af-list.c
+++ b/src/test/test-af-list.c
@@ -46,6 +46,7 @@ int main(int argc, const char *argv[]) {
         assert_se(af_to_name(af_max()) == NULL);
         assert_se(af_to_name(-1) == NULL);
         assert_se(af_from_name("huddlduddl") == AF_UNSPEC);
+        assert_se(af_from_name("") == AF_UNSPEC);
 
         return 0;
 }
diff --git a/src/test/test-arphrd-list.c b/src/test/test-arphrd-list.c
index 2949a8aae0..e503582820 100644
--- a/src/test/test-arphrd-list.c
+++ b/src/test/test-arphrd-list.c
@@ -46,6 +46,7 @@ int main(int argc, const char *argv[]) {
         assert_se(arphrd_to_name(arphrd_max()) == NULL);
         assert_se(arphrd_to_name(0) == NULL);
         assert_se(arphrd_from_name("huddlduddl") == 0);
+        assert_se(arphrd_from_name("") == 0);
 
         return 0;
 }