diff --git a/src/common/file_util.h b/src/common/file_util.h
index cd5a0c5fc..88760be2f 100644
--- a/src/common/file_util.h
+++ b/src/common/file_util.h
@@ -286,8 +286,8 @@ private:
 template <typename T>
 void OpenFStream(T& fstream, const std::string& filename, std::ios_base::openmode openmode) {
 #ifdef _MSC_VER
-    fstream.open(Common::UTF8ToUTF16W(filename).c_str(), openmode);
+    fstream.open(Common::UTF8ToUTF16W(filename), openmode);
 #else
-    fstream.open(filename.c_str(), openmode);
+    fstream.open(filename, openmode);
 #endif
 }