1 files changed, 3 insertions, 1 deletions
diff --git a/src/SpawnPrepare.h b/src/SpawnPrepare.h
index cc0da504e..3f4a3b377 100644
--- a/src/SpawnPrepare.h
+++ b/src/SpawnPrepare.h
@@ -1,6 +1,8 @@
 
 #pragma once
 
+#include <atomic>
+
 class cWorld;
 	
 
@@ -25,7 +27,7 @@ protected:
 	int m_MaxIdx;
 
 	/** Total number of chunks already finished preparing. Preparation finishes when this number reaches m_MaxIdx. */
-	int m_NumPrepared;
+	std::atomic<int> m_NumPrepared;
 
 	/** Event used to signal that the preparation is finished. */
 	cEvent m_EvtFinished;