diff --git a/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu b/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu
index 7742e740e5f3d0ad8dfe9951dd4b88b19f627a99..fa7e09364b8ce0bc6b7b945a8e1973f3a50443a7 100644
--- a/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu
+++ b/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu
@@ -734,7 +734,7 @@ void cryptonight_core_gpu_hash(nvid_ctx* ctx, uint32_t nonce)
 {
 	dim3 grid( ctx->device_blocks );
 	dim3 block( ctx->device_threads );
-	dim3 block2( ctx->device_threads << 2 );
+	dim3 block2( ctx->device_threads << 1 );
 	dim3 block4( ctx->device_threads << 2 );
 	dim3 block8( ctx->device_threads << 3 );
 
diff --git a/xmrstak/jconf.cpp b/xmrstak/jconf.cpp
index b608c0028984491b62c0ee3766201846235e5e5c..ca2fa958568dce6a7edebf2f7c68a94e2eeb027b 100644
--- a/xmrstak/jconf.cpp
+++ b/xmrstak/jconf.cpp
@@ -101,7 +101,7 @@ xmrstak::coin_selection coins[] = {
 	{ "cryptonight_v7",      {cryptonight_monero_v8, cryptonight_monero, 255u},   {cryptonight_monero_v8, cryptonight_monero, 8u}, nullptr },
 	{ "cryptonight_v8",      {cryptonight_monero, cryptonight_monero_v8, 255u},   {cryptonight_monero_v8, cryptonight_monero, 8u}, nullptr },
 	{ "cryptonight_v7_stellite", {cryptonight_monero_v8, cryptonight_stellite, 255u}, {cryptonight_monero_v8, cryptonight_monero_v8, 0u}, nullptr },
-	{ "graft",               {cryptonight_monero_v8, cryptonight_monero, 255u},   {cryptonight_monero_v8, cryptonight_monero, 8u}, nullptr },
+	{ "graft",               {cryptonight_monero_v8, cryptonight_monero, 11u},    {cryptonight_monero_v8, cryptonight_monero, 8u}, nullptr },
 	{ "haven",               {cryptonight_heavy, cryptonight_haven, 255u},        {cryptonight_heavy, cryptonight_heavy, 0u},   nullptr },
 	{ "intense",             {cryptonight_monero_v8, cryptonight_monero, 255u},   {cryptonight_monero_v8, cryptonight_monero, 8u}, nullptr },
 	{ "masari",              {cryptonight_monero_v8, cryptonight_masari, 255u},   {cryptonight_monero_v8, cryptonight_monero_v8, 0u},nullptr },
diff --git a/xmrstak/version.cpp b/xmrstak/version.cpp
index 0e78283e69626eeeef90d3ac86dfd09354c6d588..4c2bf49767e816a182d9e702190f00ac0682c18b 100644
--- a/xmrstak/version.cpp
+++ b/xmrstak/version.cpp
@@ -18,7 +18,7 @@
 #endif
 
 #define XMR_STAK_NAME "xmr-stak"
-#define XMR_STAK_VERSION "2.5.1"
+#define XMR_STAK_VERSION "2.5.2"
 
 #if defined(_WIN32)
 #define OS_TYPE "win"