diff --git a/cryptonight/cuda_cryptonight_core.cu b/cryptonight/cuda_cryptonight_core.cu
index 008e8e8..bfe8621 100755
--- a/cryptonight/cuda_cryptonight_core.cu
+++ b/cryptonight/cuda_cryptonight_core.cu
@@ -56,10 +56,9 @@ __global__ void cryptonight_core_gpu_phase2(int threads, int bfactor, int partid
 
 	__syncthreads();
 
-    int thread = (blockDim.x * blockIdx.x + threadIdx.x) >> 2;
-
 #if __CUDA_ARCH__ >= 300
 
+    int thread = (blockDim.x * blockIdx.x + threadIdx.x) >> 2;
     int sub = threadIdx.x & 3;
 
     if (thread < threads)
@@ -149,6 +148,8 @@ __global__ void cryptonight_core_gpu_phase2(int threads, int bfactor, int partid
 
 #else // __CUDA_ARCH__ < 300
 
+    int thread = blockDim.x * blockIdx.x + threadIdx.x;
+
     if (thread < threads)
     {
         int i, j;