diff --git a/README.md b/README.md
index 735ad7c7200..0bbd0896ca9 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ int main(){
 
     // Eval the sum of the list
     char* result = pkpy_vm_eval(vm, "sum(a)");
-    std::cout << result << std::endl;   // 6
+    printf("%s", result);   // 6
 
     // Free the resources
     pkpy_delete(result);
diff --git a/README_zh.md b/README_zh.md
index a7b49242bff..3bc41985849 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -63,7 +63,7 @@ int main(){
 
     // 对列表进行求和
     char* result = pkpy_vm_eval(vm, "sum(a)");
-    std::cout << result << std::endl;   // 6
+    printf("%s", result);   // 6
 
     // 释放资源
     pkpy_delete(result);