diff --git a/src/Pools/EcsPoolBase.cs b/src/Pools/EcsPoolBase.cs
index 48ca7d5..d7423e6 100644
--- a/src/Pools/EcsPoolBase.cs
+++ b/src/Pools/EcsPoolBase.cs
@@ -341,17 +341,17 @@ namespace DCFApixels.DragonECS
 
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnAdd(this StructList<IEcsPoolEventListener> self, int entityID)
+        internal static void InvokeOnAdd(ref this StructList<IEcsPoolEventListener> self, int entityID)
         {
             for (int i = 0; i < self.Count; i++) { self[i].OnAdd(entityID); }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnAdd(this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
+        internal static void InvokeOnAdd(ref this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
         {
             for (int i = 0; i < cachedCount; i++) { self[i].OnAdd(entityID); }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnAddAndGet(this StructList<IEcsPoolEventListener> self, int entityID)
+        internal static void InvokeOnAddAndGet(ref this StructList<IEcsPoolEventListener> self, int entityID)
         {
             for (int i = 0; i < self.Count; i++)
             {
@@ -360,7 +360,7 @@ namespace DCFApixels.DragonECS
             }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnAddAndGet(this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
+        internal static void InvokeOnAddAndGet(ref this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
         {
             for (int i = 0; i < cachedCount; i++)
             {
@@ -369,22 +369,22 @@ namespace DCFApixels.DragonECS
             }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnGet(this StructList<IEcsPoolEventListener> self, int entityID)
+        internal static void InvokeOnGet(ref this StructList<IEcsPoolEventListener> self, int entityID)
         {
             for (int i = 1; i < self.Count; i++) { self[i].OnGet(entityID); }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnGet(this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
+        internal static void InvokeOnGet(ref this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
         {
             for (int i = 1; i < cachedCount; i++) { self[i].OnGet(entityID); }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnDel(this StructList<IEcsPoolEventListener> self, int entityID)
+        internal static void InvokeOnDel(ref this StructList<IEcsPoolEventListener> self, int entityID)
         {
             for (int i = 0; i < self.Count; i++) { self[i].OnDel(entityID); }
         }
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static void InvokeOnDel(this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
+        internal static void InvokeOnDel(ref this StructList<IEcsPoolEventListener> self, int entityID, int cachedCount)
         {
             for (int i = 0; i < cachedCount; i++) { self[i].OnDel(entityID); }
         }