diff --git a/source/ecs/entity.d b/source/ecs/entity.d
index 09a5996..8fbc6e4 100644
--- a/source/ecs/entity.d
+++ b/source/ecs/entity.d
@@ -3,6 +3,7 @@
 */
 module ecs.entity;
 
+import ecs.system;
 import ecs.manager;
 
 /************************************************************************************************************************
diff --git a/source/ecs/manager.d b/source/ecs/manager.d
index 784ec4f..3505abd 100644
--- a/source/ecs/manager.d
+++ b/source/ecs/manager.d
@@ -14,11 +14,11 @@ import core.stdc.string;
 import core.atomic;
 import core.sync.mutex;
 
+import ecs.system;
 import ecs.entity;
 import ecs.block_allocator;
 import ecs.hash_map;
 import ecs.id_manager;
-import ecs.system;
 import ecs.vector;
 import ecs.events;
 import ecs.traits;