diff --git a/cuda/CudaPlotPhase3Step3.cu b/cuda/CudaPlotPhase3Step3.cu
index c771eb67..c24c42f5 100644
--- a/cuda/CudaPlotPhase3Step3.cu
+++ b/cuda/CudaPlotPhase3Step3.cu
@@ -277,8 +277,8 @@ void CudaK32PlotPhase3Step3( CudaK32PlotContext& cx )
     s3.parksOut.Reset();
 
     // Copy map slice counts (for the next step 2)
-    CudaErrCheck( cudaMemcpyAsync( cx.hostBucketSlices, cx.devSliceCounts, sizeof( uint32 , 51) * BBCU_BUCKET_COUNT * BBCU_BUCKET_COUNT,
-                    cudaMemcpyDeviceToHost, downloadStream ) );
+    CudaErrCheck( cudaMemcpyAsync( cx.hostBucketSlices, cx.devSliceCounts, sizeof( uint32) * BBCU_BUCKET_COUNT * BBCU_BUCKET_COUNT,
+                    cudaMemcpyDeviceToHost, downloadStream ) , 51);
 
     CudaErrCheck( cudaStreamSynchronize( downloadStream ) , 52);
     memcpy( &s3.prunedBucketSlices[0][0], cx.hostBucketSlices, sizeof( uint32 ) * BBCU_BUCKET_COUNT * BBCU_BUCKET_COUNT );
diff --git a/cuda/chacha8.cu b/cuda/chacha8.cu
index 0ebead78..61d79a11 100644
--- a/cuda/chacha8.cu
+++ b/cuda/chacha8.cu
@@ -229,7 +229,7 @@ void GenF1Cuda( CudaK32PlotContext& cx )
     }
 
     // Copy bucket slices to host
-    CudaErrCheck( cudaMemcpyAsync( cx.hostBucketSlices, cx.devSliceCounts, sizeof( uint32 , 100) * BBCU_BUCKET_COUNT * BBCU_BUCKET_COUNT,
+    CudaErrCheck( cudaMemcpyAsync( cx.hostBucketSlices, cx.devSliceCounts, sizeof( uint32) * BBCU_BUCKET_COUNT * BBCU_BUCKET_COUNT,
                         cudaMemcpyDeviceToHost, cx.computeStream ), 999 );
 
     CudaErrCheck( cudaStreamSynchronize( cx.computeStream ) , 101);