diff --git a/lib/bonuses/Updaters.cpp b/lib/bonuses/Updaters.cpp
index 4d0abdf59..c4e660479 100644
--- a/lib/bonuses/Updaters.cpp
+++ b/lib/bonuses/Updaters.cpp
@@ -200,7 +200,6 @@ JsonNode OwnerUpdater::toJsonNode() const
 
 std::shared_ptr<Bonus> OwnerUpdater::createUpdatedBonus(const std::shared_ptr<Bonus> & b, const CBonusSystemNode & context)
 {
-	std::lock_guard lock(mutex);
 	owner = context.getOwner();
 	
 	if(owner == PlayerColor::UNFLAGGABLE)
diff --git a/lib/bonuses/Updaters.h b/lib/bonuses/Updaters.h
index 67f5aee5a..0d301e91f 100644
--- a/lib/bonuses/Updaters.h
+++ b/lib/bonuses/Updaters.h
@@ -125,7 +125,6 @@ public:
 class DLL_LINKAGE OwnerUpdater : public IUpdater
 {
 protected:
-	std::mutex mutex;
 	PlayerColor owner;
 
 public: