diff --git a/TGServerService/ServerInstance/Repository.cs b/TGServerService/ServerInstance/Repository.cs
index 56e7f9684e..f66d4e8e6a 100644
--- a/TGServerService/ServerInstance/Repository.cs
+++ b/TGServerService/ServerInstance/Repository.cs
@@ -861,14 +861,14 @@ namespace TGServerService
 		}
 
 		/// <inheritdoc />
-		public string MergePullRequest(int PRNumber)
+		public string MergePullRequest(int PRNumber, string atSHA)
 		{
 			lock (RepoLock)
 			{
 				var result = LoadRepo();
 				if (result != null)
 					return result;
-				SendMessage(String.Format("REPO: Merging PR #{0}...", PRNumber), MessageType.DeveloperInfo);
+				SendMessage(String.Format("REPO: Merging PR #{0}{1}...", PRNumber, atSHA != null ? String.Format(" at commit {0}", atSHA): ""), MessageType.DeveloperInfo);
 				result = ResetNoLock(null);
 				if (result != null)
 					return result;
@@ -905,8 +905,28 @@ namespace TGServerService
 						return String.Format("PR #{0} could not be fetched. Does it exist?", PRNumber);
 					}
 
+					if (atSHA != null)
+					{
+						//find the commit
+						Commit commit = null;
+						string error = null;
+						try
+						{
+							commit = Repo.Lookup<Commit>(atSHA);
+						}
+						catch (Exception e)
+						{
+							error = e.ToString();
+						}
+						if (commit == null)
+						{
+							SendMessage("REPO: Commit could not be found, aborting!", MessageType.DeveloperInfo);
+							return error ?? String.Format("Commit {0} could not be found in the repository!", atSHA);
+						}
+					}
+
 					//so we'll know if this fails
-					var Result = MergeBranch(LocalBranchName, String.Format("Testmerge commit for pull request #{0}", PRNumber));
+					var Result = MergeBranch(atSHA ?? LocalBranchName, String.Format("Testmerge commit for pull request #{0}", PRNumber));
 
 					if (Result == null)
 						try
diff --git a/TGServiceInterface/Components/Repository.cs b/TGServiceInterface/Components/Repository.cs
index 4f5def377a..9e0f83105e 100644
--- a/TGServiceInterface/Components/Repository.cs
+++ b/TGServiceInterface/Components/Repository.cs
@@ -92,9 +92,10 @@ namespace TGServiceInterface.Components
 		/// Merges the target pull request into the current branch if the remote is a github repository
 		/// </summary>
 		/// <param name="PRnumber">The github pull request number in the remote repository</param>
+		/// <param name="atSHA">The SHA of the pull request to merge</param>
 		/// <returns><see langword="null"/> on success, error message on failure</returns>
 		[OperationContract]
-		string MergePullRequest(int PRnumber);
+		string MergePullRequest(int PRnumber, string atSHA = null);
 
 		/// <summary>
 		/// Get the currently merged pull requests. Note that switching branches will delete this list and switching back won't restore it