diff --git a/Package.swift b/Package.swift
index e4f9c11..4cf8045 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:4.0
+// swift-tools-version:4.1
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
diff --git a/Sources/FirebladeECS/FamilyTraitSet.swift b/Sources/FirebladeECS/FamilyTraitSet.swift
index d22ee5e..1d65e75 100644
--- a/Sources/FirebladeECS/FamilyTraitSet.swift
+++ b/Sources/FirebladeECS/FamilyTraitSet.swift
@@ -4,7 +4,7 @@
 //
 //  Created by Christian Treffs on 09.10.17.
 //
-
+import Swift
 public struct FamilyTraitSet: CustomStringConvertible, CustomDebugStringConvertible {
 
 	public let requiresAll: ComponentSet
@@ -25,7 +25,7 @@ public struct FamilyTraitSet: CustomStringConvertible, CustomDebugStringConverti
 
 		isEmptyAny = one.isEmpty
 
-		setHash = hash(combine: [all, one, none])
+        setHash = FirebladeECS.hash(combine: [all, one, none])
 
 		self.requiresAll = all
 		self.needsAtLeastOne = one