diff --git a/windows/threat-protection/windows-defender-atp/experiment-custom-ti-windows-defender-advanced-threat-protection.md b/windows/threat-protection/windows-defender-atp/experiment-custom-ti-windows-defender-advanced-threat-protection.md
index 073acf1b34..a74dd4b020 100644
--- a/windows/threat-protection/windows-defender-atp/experiment-custom-ti-windows-defender-advanced-threat-protection.md
+++ b/windows/threat-protection/windows-defender-atp/experiment-custom-ti-windows-defender-advanced-threat-protection.md
@@ -134,7 +134,7 @@ This step will guide you in simulating an event in connection to a malicious IP
 ## Step 4: Explore the custom alert in the portal
 This step will guide you in exploring the custom alert in the portal.
 
-1.	Open the [Windows Defender ATP portal](http: /securitycenter.windows.com/) on a browser.
+1.	Open the [Windows Defender ATP portal](http://securitycenter.windows.com/) on a browser.
 
 2.	Log in with your Windows Defender ATP credentials.