diff --git a/OpenSim/Services/Interfaces/IAuthenticationService.cs b/OpenSim/Services/Interfaces/IAuthenticationService.cs
index 25ceaa6f59..3c46a97e6a 100644
--- a/OpenSim/Services/Interfaces/IAuthenticationService.cs
+++ b/OpenSim/Services/Interfaces/IAuthenticationService.cs
@@ -9,6 +9,6 @@ namespace OpenSim.Services.Interfaces
 
         bool VerifyKey(UUID userID, string key);
         
-        bool VerifySession(UUID iserID, UUID sessionID);
+        bool VerifySession(UUID userID, UUID sessionID);
     }
 }