diff --git a/src/cuda/CUDAStream.h b/src/cuda/CUDAStream.h
index bb3f866..83b8c66 100644
--- a/src/cuda/CUDAStream.h
+++ b/src/cuda/CUDAStream.h
@@ -22,7 +22,7 @@
 #endif
 
 #define TBSIZE 1024
-#define DOT_NUM_BLOCKS 1024
+#define DOT_NUM_BLOCKS 256
 
 template <class T>
 class CUDAStream : public Stream<T>