diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2624322..ea121be 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -67,6 +67,7 @@ jobs:
         - windows-latest
         haxe:
         - nightly
+        - 4.3.1
         - 4.2.5
 
     steps:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7dc9f77..73e0e47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- "Null safety: Cannot pass nullable value to not-nullable argument" with Haxe 4.3
+
+
 ## [0.1.0] - 2023-02-17
 
 ### Added
diff --git a/src/hx/sshclient/SSHClient.hx b/src/hx/sshclient/SSHClient.hx
index f9b4f62..78409c2 100644
--- a/src/hx/sshclient/SSHClient.hx
+++ b/src/hx/sshclient/SSHClient.hx
@@ -34,13 +34,15 @@ abstract class SSHClient {
    public var compression(default, null):Bool = false;
 
 
-   function new() {
+   inline function new() {
    }
 
+
    public abstract function execute(cmd:String):BackgroundProcess;
 
 
    public function toString():String {
+      @:nullSafety(Off)
       return '${Type.getClassName(Type.getClass(this))}[${username}@${hostname}:${port},Secret(${secret.getName()})]';
    }
 }
@@ -58,6 +60,7 @@ class SSHClientBuilder<T:SSHClient, This:SSHClientBuilder<T, This>> {
    inline function new() {
    }
 
+
    public function build():T {
       if (clientBuilt)
          throw "Already built!";