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 );