diff --git a/blcrack/cracker/cracker.hpp b/blcrack/cracker/cracker.hpp
index af5e510d8..32cc1de31 100644
--- a/blcrack/cracker/cracker.hpp
+++ b/blcrack/cracker/cracker.hpp
@@ -133,17 +133,17 @@ private:
     static void clear_hard_mode_ship_properties_limit(Lua::Table& t);
 
     struct {
-        bool GLOBAL_SHIP_PROPERTIES_CRACK = false;
-        bool SPECIFIC_SHIP_PROPERTIES_CRACK = false;
-        bool FAST_STAGE_MOVE_CRACK = false;
-        bool REMOVE_HARD_MODE_SHIP_PROPERTIES_LIMIT = false;
-        bool REMOVE_HARD_MODE_SHIP_TYPE_LIMIT = false;
-        bool FAKE_PLAYER_INFO = false;
-        bool NO_BB_ANIMATION = false;
-        bool NO_EMOTION_WARNING = false;
-        bool OPSI_FAST_MOVE = false;
-        bool GG_FACTOR = false;
-        bool GLOBAL_SPEEDUP = false;
+        volatile bool GLOBAL_SHIP_PROPERTIES_CRACK = false;
+        volatile bool SPECIFIC_SHIP_PROPERTIES_CRACK = false;
+        volatile bool FAST_STAGE_MOVE_CRACK = false;
+        volatile bool REMOVE_HARD_MODE_SHIP_PROPERTIES_LIMIT = false;
+        volatile bool REMOVE_HARD_MODE_SHIP_TYPE_LIMIT = false;
+        volatile bool FAKE_PLAYER_INFO = false;
+        volatile bool NO_BB_ANIMATION = false;
+        volatile bool NO_EMOTION_WARNING = false;
+        volatile bool OPSI_FAST_MOVE = false;
+        volatile bool GG_FACTOR = false;
+        volatile bool GLOBAL_SPEEDUP = false;
     } m_flag;
 
     struct {