diff --git a/Sources/CryptoExtras/EC/Curve25519+PEM.swift b/Sources/CryptoExtras/EC/Curve25519+PEM.swift
index 5e8071c8..2176068e 100644
--- a/Sources/CryptoExtras/EC/Curve25519+PEM.swift
+++ b/Sources/CryptoExtras/EC/Curve25519+PEM.swift
@@ -13,7 +13,11 @@
 //===----------------------------------------------------------------------===//
 
 import Crypto
+#if canImport(FoundationEssentials)
+import FoundationEssentials
+#else
 import Foundation
+#endif
 import SwiftASN1
 
 @available(iOS 14.0, macOS 11.0, watchOS 7.0, tvOS 14.0, *)
diff --git a/Sources/CryptoExtras/EC/PKCS8DERRepresentation.swift b/Sources/CryptoExtras/EC/PKCS8DERRepresentation.swift
index bfaf11f4..390c0c5b 100644
--- a/Sources/CryptoExtras/EC/PKCS8DERRepresentation.swift
+++ b/Sources/CryptoExtras/EC/PKCS8DERRepresentation.swift
@@ -13,7 +13,11 @@
 //===----------------------------------------------------------------------===//
 
 import Crypto
+#if canImport(FoundationEssentials)
+import FoundationEssentials
+#else
 import Foundation
+#endif
 import SwiftASN1
 
 @available(iOS 14.0, macOS 11.0, watchOS 7.0, tvOS 14.0, *)
diff --git a/Tests/CryptoExtrasTests/CMACTests.swift b/Tests/CryptoExtrasTests/CMACTests.swift
index 386d906e..df858b2b 100644
--- a/Tests/CryptoExtrasTests/CMACTests.swift
+++ b/Tests/CryptoExtrasTests/CMACTests.swift
@@ -13,7 +13,11 @@
 //===----------------------------------------------------------------------===//
 import Crypto
 import CryptoExtras
+#if canImport(FoundationEssentials)
+import FoundationEssentials
+#else
 import Foundation
+#endif
 import XCTest
 
 final class CMACTests: XCTestCase {
diff --git a/Tests/CryptoExtrasTests/ECToolbox/BoringSSL/ECToolboxBoringSSLTests.swift b/Tests/CryptoExtrasTests/ECToolbox/BoringSSL/ECToolboxBoringSSLTests.swift
index 4ce8552f..6ffb5f6d 100644
--- a/Tests/CryptoExtrasTests/ECToolbox/BoringSSL/ECToolboxBoringSSLTests.swift
+++ b/Tests/CryptoExtrasTests/ECToolbox/BoringSSL/ECToolboxBoringSSLTests.swift
@@ -12,7 +12,11 @@
 //
 //===----------------------------------------------------------------------===//
 import Crypto
+#if canImport(FoundationEssentials)
+import FoundationEssentials
+#else
 import Foundation
+#endif
 import XCTest
 
 #if !canImport(Darwin) || canImport(CryptoKit, _version: 241.100.42)
diff --git a/Tests/CryptoExtrasTests/PKCS8DERRepresentationTests.swift b/Tests/CryptoExtrasTests/PKCS8DERRepresentationTests.swift
index f464e13b..62af0942 100644
--- a/Tests/CryptoExtrasTests/PKCS8DERRepresentationTests.swift
+++ b/Tests/CryptoExtrasTests/PKCS8DERRepresentationTests.swift
@@ -13,7 +13,11 @@
 //===----------------------------------------------------------------------===//
 
 import Crypto
+#if canImport(FoundationEssentials)
+import FoundationEssentials
+#else
 import Foundation
+#endif
 import XCTest
 
 @testable import CryptoExtras