diff --git a/engine/priority_dependency.h b/engine/priority_dependency.h
index 23be5f6e9..838c71d6b 100644
--- a/engine/priority_dependency.h
+++ b/engine/priority_dependency.h
@@ -3,6 +3,7 @@
 
 #include "../util/math/vector3f.h"
 #include "../util/tasks/task_priority.h"
+#include <atomic>
 #include <memory>
 #include <vector>