diff --git a/include/debug_tools/print_tools.h b/include/debug_tools/print_tools.h
index f128306..68e0a33 100644
--- a/include/debug_tools/print_tools.h
+++ b/include/debug_tools/print_tools.h
@@ -27,9 +27,9 @@ namespace Net {
 
         void printRed(string red_info);
 
-        void printInfo(const string& info, const string& tag = "");
+        void printInfo(const string& info, const string& tag);
 
-        void printInfoBuffer(const string& info, const string& tag = "");
+        void printInfoBuffer(const string& info, const string& tag);
 
         void printInfoFormal(const string& title, initializer_list<FormalItem> body);
     }