diff --git a/FileUtils.h b/FileUtils.h
index 3323cb5c..46d43e14 100644
--- a/FileUtils.h
+++ b/FileUtils.h
@@ -110,7 +110,7 @@ public:
 	void Close();
 	void ClearBuffer();
 
-	bool TryExLock(const CString& sLockFile, int iFlags = O_RDONLY | O_CREAT);
+	bool TryExLock(const CString& sLockFile, int iFlags = O_RDWR | O_CREAT);
 	bool TryExLock();
 	bool ExLock();
 	bool UnLock();