diff --git a/Hashes.h b/Hashes.h
index 5c5fda63..e2aea0de 100644
--- a/Hashes.h
+++ b/Hashes.h
@@ -563,6 +563,7 @@ void clhash_seed_init(size_t &seed);
 void clhash_test (const void * key, int len, uint32_t seed, void * out);
 #endif
 
+#ifndef _MSC_VER
 // objsize 454880-4554f3: 2911
 void halftime_hash_style64_test(const void *key, int len, uint32_t seed, void *out);
 // 455e90 - 45682e: 2462
@@ -571,6 +572,7 @@ void halftime_hash_style128_test(const void *key, int len, uint32_t seed, void *
 void halftime_hash_style256_test(const void *key, int len, uint32_t seed, void *out);
 // 457a60 - 45883e: 3550 (without AVX512 on Ryzen3)
 void halftime_hash_style512_test(const void *key, int len, uint32_t seed, void *out);
+#endif
 void halftime_hash_init();
 void halftime_hash_seed_init(size_t &seed);
 
diff --git a/main.cpp b/main.cpp
index 65401c80..ae273da5 100644
--- a/main.cpp
+++ b/main.cpp
@@ -698,6 +698,7 @@ HashInfo g_hashes[] =
 { umash,                64, 0x161495C6, "umash64",     "umash 64", GOOD, {} },
 { umash128,            128, 0x36D4EC95, "umash128",    "umash 128", GOOD, {} },
 #endif
+#ifndef _MSC_VER
 { halftime_hash_style64_test,  64, 0x0, "halftime_hash64",    "NH tree hash variant", GOOD,
   {0xc61d672b, 0xcc70c4c1798e4a6f, 0xd3833e804f4c574b, 0xecfc1357d65941ae, 0xbe1927f97b8c43f1, 
    0xf4d4beb14ae042bbULL, 0x9a9b4c4e44dd48d1ULL} }, // not vulnerable
@@ -710,7 +711,7 @@ HashInfo g_hashes[] =
 { halftime_hash_style512_test, 64, 0x0, "halftime_hash512",   "NH tree hash variant", GOOD,
   {0xc61d672b, 0xcc70c4c1798e4a6f, 0xd3833e804f4c574b, 0xecfc1357d65941ae, 0xbe1927f97b8c43f1, 
    0xf4d4beb14ae042bbULL, 0x9a9b4c4e44dd48d1ULL} },
-
+#endif
 { t1ha2_atonce_test,           64, 0x8F16C948, "t1ha2_atonce",    "Fast Positive Hash (portable", GOOD, {
   } },
 { t1ha2_stream_test,           64, 0xDED9B580, "t1ha2_stream",    "Fast Positive Hash (portable)", POOR, {} },