diff --git a/cuda_helper.h b/cuda_helper.h
index 8eb46f3ba2..a3e10197f1 100644
--- a/cuda_helper.h
+++ b/cuda_helper.h
@@ -519,8 +519,8 @@ __device__ __inline__ uint2 ROR2(const uint2 v, const int n)
 	}
 	else 
 	{
-		result.y = ((v.x >> (n - 32)) | (v.y << (32 - n)));
-		result.x = ((v.y >> (n - 32)) | (v.x << (32 - n)));
+		result.y = ((v.x >> (n - 32)) | (v.y << (64 - n)));
+		result.x = ((v.y >> (n - 32)) | (v.x << (64 - n)));
 	}
 	return result;
 }