diff --git a/swift/TailscaleKit/OutgoingConnection.swift b/swift/TailscaleKit/OutgoingConnection.swift
index 97195f9..dc86aa5 100644
--- a/swift/TailscaleKit/OutgoingConnection.swift
+++ b/swift/TailscaleKit/OutgoingConnection.swift
@@ -101,7 +101,9 @@ public actor OutgoingConnection {
             throw TailscaleError.connectionClosed
         }
 
-        let bytesWritten = Darwin.write(conn, data.withUnsafeBytes { $0.baseAddress! }, data.count)
+        let bytesWritten = data.withUnsafeBytes { bytes in
+            Darwin.write(conn, bytes.baseAddress, bytes.count)
+        }
 
         if bytesWritten != data.count {
             throw TailscaleError.shortWrite
diff --git a/swift/TailscaleKitXCTests/TailscaleKitTests.swift b/swift/TailscaleKitXCTests/TailscaleKitTests.swift
index 8713f98..9c19cf8 100644
--- a/swift/TailscaleKitXCTests/TailscaleKitTests.swift
+++ b/swift/TailscaleKitXCTests/TailscaleKitTests.swift
@@ -37,10 +37,13 @@ final class TailscaleKitTests: XCTestCase {
         try await runConnectionTests(for: .v6)
     }
 
-    func runConnectionTests(for netType: IPAddrType) async throws {
-        let logger = BlackholeLogger()
+    func testSendShortMessage() async throws {
+        try await runConnectionTests(for: .v4, message: Data("ping".utf8))
+    }
 
-        let want = "Hello Tailscale".data(using: .utf8)!
+    func runConnectionTests(for netType: IPAddrType,
+                            message want: Data = Data("Hello Tailscale".utf8)) async throws {
+        let logger = BlackholeLogger()
 
         do {
             let ts1 = try TailscaleNode(config: mockConfig(), logger: logger)
@@ -95,7 +98,7 @@ final class TailscaleKitTests: XCTestCase {
 
                 let got = try await inbound.receiveMessage(timeout: 2)
                 print("got \(got)")
-                XCTAssert(got == want)
+                XCTAssertEqual(got, want)
 
                 msgReceived.fulfill()
             }