diff --git a/Sources/FirebladeECS/Component.swift b/Sources/FirebladeECS/Component.swift
index b25d5d9..b707e36 100644
--- a/Sources/FirebladeECS/Component.swift
+++ b/Sources/FirebladeECS/Component.swift
@@ -5,7 +5,7 @@
 //  Created by Christian Treffs on 08.10.17.
 //
 
-public protocol Component: AnyObject, TypeIdentifiable {}
+public protocol Component: class, TypeIdentifiable {}
 public typealias ComponentIdentifier = ObjectIdentifier
 
 public extension Component {
diff --git a/Sources/FirebladeECS/ManagedContiguousArray.swift b/Sources/FirebladeECS/ManagedContiguousArray.swift
index 0befaa4..3344c62 100644
--- a/Sources/FirebladeECS/ManagedContiguousArray.swift
+++ b/Sources/FirebladeECS/ManagedContiguousArray.swift
@@ -5,7 +5,7 @@
 //  Created by Christian Treffs on 28.10.17.
 //
 
-public protocol UniformStorage: AnyObject {
+public protocol UniformStorage: class {
 	associatedtype Element
 	associatedtype Index
 
diff --git a/Sources/FirebladeECS/Nexus.swift b/Sources/FirebladeECS/Nexus.swift
index 79a49a5..758078f 100644
--- a/Sources/FirebladeECS/Nexus.swift
+++ b/Sources/FirebladeECS/Nexus.swift
@@ -21,7 +21,7 @@ public typealias EntityIdInFamilyIndex = Int
 public typealias TraitEntityIdHashSet = [TraitEntityIdHash: EntityIdInFamilyIndex]
 public typealias SparseComponentIdentifierSet = UnorderedSparseSet<ComponentIdentifier>
 
-public protocol NexusDelegate: AnyObject {
+public protocol NexusDelegate: class {
 	func nexusEventOccurred(_ event: ECSEvent)
 	func nexusRecoverableErrorOccurred(_ message: String)
 }
diff --git a/Sources/FirebladeECS/TypedFamily.swift b/Sources/FirebladeECS/TypedFamily.swift
index 386b2f3..65cac5a 100644
--- a/Sources/FirebladeECS/TypedFamily.swift
+++ b/Sources/FirebladeECS/TypedFamily.swift
@@ -10,7 +10,7 @@
 // * define read/write access
 // * set size and storage constraints
 
-public protocol TypedFamilyProtocol: AnyObject, Equatable, Sequence {
+public protocol TypedFamilyProtocol: class, Equatable, Sequence {
     associatedtype EntityComponentsSequence: EntityComponentsSequenceProtocol
 
     var traits: FamilyTraitSet { get }