diff --git a/src/Playwright/Core/BrowserType.cs b/src/Playwright/Core/BrowserType.cs
index 4cf3d95c89..3eba32758e 100644
--- a/src/Playwright/Core/BrowserType.cs
+++ b/src/Playwright/Core/BrowserType.cs
@@ -73,7 +73,7 @@ public async Task<IBrowser> LaunchAsync(BrowserTypeLaunchOptions options = defau
                 { "tracesDir", options.TracesDir },
                 { "firefoxUserPrefs", options.FirefoxUserPrefs },
                 { "chromiumSandbox", options.ChromiumSandbox },
-                { "slowMo", options.ChromiumSandbox },
+                { "slowMo", options.SlowMo },
                 { "timeout", options.Timeout },
             }).ConfigureAwait(false);
         DidLaunchBrowser(browser);