diff --git a/dotnet/src/webdriver/JavaScriptEngine.cs b/dotnet/src/webdriver/JavaScriptEngine.cs
index b988ef0788048..02bdd5c70b928 100644
--- a/dotnet/src/webdriver/JavaScriptEngine.cs
+++ b/dotnet/src/webdriver/JavaScriptEngine.cs
@@ -54,7 +54,7 @@ public JavaScriptEngine(IWebDriver driver)
             this.session = new Lazy<DevToolsSession>(() =>
             {
                 IDevTools devToolsDriver = driver as IDevTools;
-                if (session == null)
+                if (devToolsDriver == null)
                 {
                     throw new WebDriverException("Driver must implement IDevTools to use these features");
                 }