diff --git a/bench/algorithm/binarytrees/1.cs b/bench/algorithm/binarytrees/1.cs
index 5e64b0611..ef08d15fd 100644
--- a/bench/algorithm/binarytrees/1.cs
+++ b/bench/algorithm/binarytrees/1.cs
@@ -61,7 +61,7 @@ public static void Main(string[] args)
         for (int i = 0; i < nResults; i++)
         {
             var depth = i * 2 + MinDepth;
-            var n = (1 << maxDepth - depth + MinDepth);
+            var n = 1 << (maxDepth - depth + MinDepth);
 
             var check = 0;
             for (int j = 0; j < n; j++)