diff --git a/src/tests/ffi-key-sig.cpp b/src/tests/ffi-key-sig.cpp
index cae983f0c..a97d2fd12 100644
--- a/src/tests/ffi-key-sig.cpp
+++ b/src/tests/ffi-key-sig.cpp
@@ -903,6 +903,8 @@ TEST_F(rnp_tests, test_ffi_sig_validity)
     assert_rnp_success(rnp_signature_get_expiration(sig, &expires));
     assert_int_equal(expires, 86400);
     uint32_t features = 0;
+    assert_rnp_failure(rnp_signature_get_features(NULL, &features));
+    assert_rnp_failure(rnp_signature_get_features(sig, NULL));
     assert_rnp_success(rnp_signature_get_features(sig, &features));
     assert_int_equal(features, 0);
     rnp_signature_handle_destroy(sig);