diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1527ace..76753d9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,3 +28,16 @@ jobs:
         uses: actions/checkout@v3
       - name: Run Tests
         run: swift test
+  linux:
+    name: Linux (Swift ${{ matrix.swift }})
+    strategy:
+      fail-fast: false
+      matrix:
+        swift: ["5.5", "5.6"]
+    runs-on: ubuntu-latest
+    container: swift:${{ matrix.swift }}
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+      - name: Run Tests
+        run: swift test
diff --git a/Sources/HTTPHeaders/HTTPHeader.swift b/Sources/HTTPHeaders/HTTPHeader.swift
index ee21b7a..2d94b76 100644
--- a/Sources/HTTPHeaders/HTTPHeader.swift
+++ b/Sources/HTTPHeaders/HTTPHeader.swift
@@ -1,4 +1,7 @@
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 
 public struct HTTPHeader<T> {
     public let field: String
diff --git a/Tests/HTTPHeadersTests/HTTPHeadersTests.swift b/Tests/HTTPHeadersTests/HTTPHeadersTests.swift
index a57e6c9..1f4b5b2 100644
--- a/Tests/HTTPHeadersTests/HTTPHeadersTests.swift
+++ b/Tests/HTTPHeadersTests/HTTPHeadersTests.swift
@@ -1,5 +1,8 @@
-import XCTest
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 @testable import HTTPHeaders
+import XCTest
 
 final class HTTPHeadersTests: XCTestCase {
     func testParseString() throws {