diff --git a/test/connector_c/tt.c b/test/connector_c/tt.c
index 75c5988774a3df232c423cd1b1d7ac70566dfd2b..0e531407aeaa644beda32827c6c250d021446e72 100644
--- a/test/connector_c/tt.c
+++ b/test/connector_c/tt.c
@@ -201,6 +201,7 @@ static void tt_tnt_tuple_set(struct tt_test *test) {
 	tnt_enc_write(buf + off, 64);
 	off += esize + 64;
 	struct tnt_tuple t;
+	tnt_tuple_init(&t);
 	TT_ASSERT(tnt_tuple_set(&t, buf, 70) == NULL);
 	TT_ASSERT(tnt_tuple_set(&t, buf, sizeof(buf)) != NULL);
 	tnt_tuple_free(&t);