diff --git a/client/battle/BattleInterface.cpp b/client/battle/BattleInterface.cpp
index 53fb5f3c7..1f49a635c 100644
--- a/client/battle/BattleInterface.cpp
+++ b/client/battle/BattleInterface.cpp
@@ -727,7 +727,7 @@ void BattleInterface::requestAutofightingAIToTakeAction()
 			// FIXME: unsafe
 			// Run task in separate thread to avoid UI lock while AI is making turn (which might take some time)
 			// HOWEVER this thread won't atttempt to lock game state, potentially leading to races
-			boost::thread aiThread([&]()
+			boost::thread aiThread([this, activeStack]()
 			{
 				curInt->autofightingAI->activeStack(activeStack);
 			});