diff --git a/tests/spdylay_frame_test.c b/tests/spdylay_frame_test.c
index 897ce60..9f32268 100644
--- a/tests/spdylay_frame_test.c
+++ b/tests/spdylay_frame_test.c
@@ -87,7 +87,7 @@ void test_spdylay_frame_count_unpack_nv_space()
   spdylay_put_uint16be(out+2, temp+1);
   CU_ASSERT(SPDYLAY_ERR_INVALID_ARGUMENT ==
             spdylay_frame_count_unpack_nv_space(&nvlen, &buflen, out, inlen));
-  spdylay_put_uint16be(out+2, 65536);
+  spdylay_put_uint16be(out+2, 65535);
   CU_ASSERT(SPDYLAY_ERR_INVALID_ARGUMENT ==
             spdylay_frame_count_unpack_nv_space(&nvlen, &buflen, out, inlen));
 }