diff --git a/src/slic3r/GUI/DeviceManager.hpp b/src/slic3r/GUI/DeviceManager.hpp
index cdf6f024de..8814cad99b 100644
--- a/src/slic3r/GUI/DeviceManager.hpp
+++ b/src/slic3r/GUI/DeviceManager.hpp
@@ -980,8 +980,8 @@ public:
     std::string m_printer_preset_name;
     std::map<std::string, std::pair<int, int>> m_filament_list; // filament_id, pair<min temp, max temp>
     void update_filament_list();
-    int get_flag_bits(std::string str, int start, int count);
-    int get_flag_bits(int num, int start, int count);
+    int get_flag_bits(std::string str, int start, int count = 1);
+    int get_flag_bits(int num, int start, int count = 1);
     void update_printer_preset_name(const std::string &nozzle_diameter_str);
 };