diff --git a/source/ecs/manager.d b/source/ecs/manager.d
index d603b30..aa8c20a 100644
--- a/source/ecs/manager.d
+++ b/source/ecs/manager.d
@@ -1121,11 +1121,11 @@ class EntityManager
                 current_delta += entites_in_block * components[id].size;
             }
 
-            foreach (uint i, ref system; systems)
+            foreach (i, ref system; systems)
             {
                 if (system.m_update is null)
                     continue;
-                addSystemCaller(*info, i);
+                addSystemCaller(*info, cast(uint)i);
             }
 
             entities_infos.add(info.components, info);
@@ -1930,13 +1930,13 @@ class EntityManager
             qsort(pass.system_callers.array.ptr, pass.system_callers.length,
                     (SystemCaller*).sizeof, &compareSystems);
 
-            foreach (uint i, caller; pass.system_callers)
-                caller.job_group.id = i;
+            foreach (i, caller; pass.system_callers)
+                caller.job_group.id = cast(uint)i;
 
             int priority = int.min;
             uint beg = 0;
             index = 0;
-            foreach (uint i, caller; pass.system_callers)
+            foreach (i, caller; pass.system_callers)
             {
                 index = 0;
                 foreach (ex; caller.exclusion)