diff --git a/Package.swift b/Package.swift
index 83d8f3a6..e2e96810 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,6 +1,6 @@
 // swift-tools-version:5.8
 import PackageDescription
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials
diff --git a/Sources/Zip/ArchiveFile.swift b/Sources/Zip/ArchiveFile.swift
index b4585bfe..c7216a13 100644
--- a/Sources/Zip/ArchiveFile.swift
+++ b/Sources/Zip/ArchiveFile.swift
@@ -1,4 +1,4 @@
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials
diff --git a/Sources/Zip/Date+dosDate.swift b/Sources/Zip/Date+dosDate.swift
index 588d243b..05394129 100644
--- a/Sources/Zip/Date+dosDate.swift
+++ b/Sources/Zip/Date+dosDate.swift
@@ -1,4 +1,4 @@
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials
diff --git a/Sources/Zip/QuickZip.swift b/Sources/Zip/QuickZip.swift
index 7afdcc0e..7b93c29e 100644
--- a/Sources/Zip/QuickZip.swift
+++ b/Sources/Zip/QuickZip.swift
@@ -6,7 +6,7 @@
 //  Copyright © 2016 Roy Marmelstein. All rights reserved.
 //
 
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials
diff --git a/Sources/Zip/Zip.swift b/Sources/Zip/Zip.swift
index 672dddc5..ccbab051 100644
--- a/Sources/Zip/Zip.swift
+++ b/Sources/Zip/Zip.swift
@@ -6,7 +6,7 @@
 //  Copyright © 2015 Roy Marmelstein. All rights reserved.
 //
 
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials
diff --git a/Sources/Zip/ZipError.swift b/Sources/Zip/ZipError.swift
index 2c811388..12f568bb 100644
--- a/Sources/Zip/ZipError.swift
+++ b/Sources/Zip/ZipError.swift
@@ -1,4 +1,4 @@
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials
diff --git a/Sources/Zip/ZipUtilities.swift b/Sources/Zip/ZipUtilities.swift
index 3d4ee61b..599cf895 100644
--- a/Sources/Zip/ZipUtilities.swift
+++ b/Sources/Zip/ZipUtilities.swift
@@ -6,7 +6,7 @@
 //  Copyright © 2016 Roy Marmelstein. All rights reserved.
 //
 
-#if canImport(Darwin)
+#if canImport(Darwin) || swift(<6.0)
 import Foundation
 #else
 import FoundationEssentials