diff --git a/test/benchmark/smallpt/README.md b/test/benchmark/smallpt/README.md
index 853bd56..b94996b 100644
--- a/test/benchmark/smallpt/README.md
+++ b/test/benchmark/smallpt/README.md
@@ -9,7 +9,7 @@ TODO
 ### Building
 
 ```sh
-wasic++ -O3 -Wl,-z,stack-size=$[256*1024] smallpt-ex.cpp -o smallpt-ex.wasm
+wasic++ -O3 -Wl,-z,stack-size=$[1024*1024] smallpt-ex.cpp -o smallpt-ex.wasm
 ```
 
 ### Running
diff --git a/test/benchmark/smallpt/smallpt-ex.wasm b/test/benchmark/smallpt/smallpt-ex.wasm
index ff07e66..39fd028 100755
Binary files a/test/benchmark/smallpt/smallpt-ex.wasm and b/test/benchmark/smallpt/smallpt-ex.wasm differ
diff --git a/test/benchmark/smallpt/smallpt.wasm b/test/benchmark/smallpt/smallpt.wasm
index 09020ac..08e4fc6 100755
Binary files a/test/benchmark/smallpt/smallpt.wasm and b/test/benchmark/smallpt/smallpt.wasm differ