diff --git a/libnm-core/tests/test-general.c b/libnm-core/tests/test-general.c
index 3b75e0f7a2..0ccdd5d219 100644
--- a/libnm-core/tests/test-general.c
+++ b/libnm-core/tests/test-general.c
@@ -7761,7 +7761,7 @@ test_nm_in_set (void)
 	_ASSERT (5,  NM_IN_SET_SE (-1, G( 1), G( 2), G( 3), G(-1), G( 5)));
 	_ASSERT (6,  NM_IN_SET_SE (-1, G( 1), G( 2), G( 3), G( 4), G( 5), G(-1)));
 
-	(void) NM_IN_SET ("a",  "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16");
+	g_assert (!NM_IN_SET (0,  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16));
 #undef G
 #undef N
 #undef _ASSERT
@@ -7888,7 +7888,9 @@ test_nm_in_strset (void)
 	_ASSERT (6,  NM_IN_STRSET ("a",  G(NULL), G("b"),  G("c"),  G("d"),  G("e"),  G("a")));
 	_ASSERT (6, !NM_IN_STRSET ("a",  G(NULL), G("b"),  G("c"),  G("d"),  G("e"),  G("f")));
 
-	(void) NM_IN_STRSET ("a",  "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16");
+	g_assert (!NM_IN_STRSET (NULL,  "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16"));
+	g_assert (!NM_IN_STRSET ("_",   "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16"));
+	g_assert ( NM_IN_STRSET ("10",  "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16"));
 #undef G
 #undef N
 #undef _ASSERT