diff --git a/src/script/script_storage.hpp b/src/script/script_storage.hpp
index 6f856908d5..3edfe978c1 100644
--- a/src/script/script_storage.hpp
+++ b/src/script/script_storage.hpp
@@ -17,6 +17,7 @@
 #include "../goal_type.h"
 #include "../story_type.h"
 
+#include "script_types.hpp"
 #include "script_log_types.hpp"
 
 #include "table/strings.h"
@@ -49,7 +50,7 @@ private:
 
 	CommandCost costs;               ///< The costs the script is tracking.
 	Money last_cost;                 ///< The last cost of the command.
-	uint last_error;                 ///< The last error of the command.
+	ScriptErrorType last_error{}; ///< The last error of the command.
 	bool last_command_res;           ///< The last result of the command.
 
 	CommandDataBuffer last_data;     ///< The last data passed to a command.
@@ -76,7 +77,6 @@ public:
 		allow_do_command  (true),
 		/* costs (can't be set) */
 		last_cost         (0),
-		last_error        (STR_NULL),
 		last_command_res  (true),
 		last_cmd          (CMD_END),
 		/* calback_value (can't be set) */