diff --git a/a8/pyengine.cc b/a8/pyengine.cc
index fe5f75e..9e1cf03 100644
--- a/a8/pyengine.cc
+++ b/a8/pyengine.cc
@@ -192,8 +192,10 @@ __builtins__.export_global = export_global
 
     bool PyEngine::LoadModule(const char* module_name)
     {
-        std::string real_filename = work_path + module_name;
-        a8::ReplaceString(real_filename, ".", "/");
+        std::string module_name_str = module_name;
+        a8::ReplaceString(module_name_str, ".", "/");
+
+        std::string real_filename = work_path + module_name_str;
         real_filename = real_filename + ".py";
 
         FILE* fp = fopen(real_filename.c_str(), "r");