diff --git a/src/types.cpp b/src/types.cpp
index 861841b59..29412fa25 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -255,7 +255,7 @@ struct TypeProc {
 		Slice<Entity *> variables; /* Entity_Variable */  \
 		i64 *           offsets;                          \
 		BlockingMutex   mutex; /* for settings offsets */ \
-		bool            are_offsets_being_processed;      \
+		std::atomic<bool> are_offsets_being_processed;    \
 		bool            are_offsets_set;                  \
 		bool            is_packed;                        \
 	})                                                        \