diff --git a/Runner/Helpers/RuntimeHelpers.cs b/Runner/Helpers/RuntimeHelpers.cs
index c1f8acb..3cb1dc4 100644
--- a/Runner/Helpers/RuntimeHelpers.cs
+++ b/Runner/Helpers/RuntimeHelpers.cs
@@ -21,11 +21,12 @@ public static async Task CloneRuntimeAsync(JobBase job)
         if (OperatingSystem.IsLinux())
         {
             string script = UpdateMergePlaceholders(
-                """
+                $$$"""
                 set -e
 
-                git clone --no-tags --single-branch --progress https://github.com/dotnet/runtime runtime
+                git clone --no-tags --branch {{{job.BaseBranch}}} --single-branch --progress https://github.com/{{{job.BaseRepo}}} runtime
                 cd runtime
+
                 git log -1
                 chmod 777 build.sh
                 git config --global user.email build@build.foo
@@ -37,7 +38,7 @@ git config --global user.name build
 
                 {{MERGE_PR_BRANCHES}}
 
-                git switch main
+                git switch {{{job.BaseBranch}}}
 
                 eng/install-native-dependencies.sh linux
                 """);
@@ -49,9 +50,9 @@ git config --global user.name build
         else
         {
             string script = UpdateMergePlaceholders(
-                """
+                $$$"""
                 git config --system core.longpaths true
-                git clone --no-tags --single-branch --progress https://github.com/dotnet/runtime runtime
+                git clone --no-tags --branch {{{job.BaseBranch}}} --single-branch --progress https://github.com/{{{job.BaseRepo}}} runtime
                 cd runtime
                 git log -1
                 git config --global user.email build@build.foo
@@ -63,7 +64,7 @@ git config --global user.name build
 
                 {{MERGE_PR_BRANCHES}}
 
-                git switch main
+                git switch {{{job.BaseBranch}}}
                 """);
 
             await job.LogAsync($"Using runtime setup script:\n{script}");
@@ -87,7 +88,7 @@ string GetMergeScript(string name)
 
             if (name == "combineWith")
             {
-                prList.Insert(0, (job.SourceRepo, job.SourceBranch));
+                prList.Insert(0, (job.PrRepo, job.PrBranch));
             }
 
             return string.Join('\n', prList
diff --git a/Runner/JobBase.cs b/Runner/JobBase.cs
index c39221a..f87d1f3 100644
--- a/Runner/JobBase.cs
+++ b/Runner/JobBase.cs
@@ -34,8 +34,10 @@ public abstract class JobBase
     public readonly ConcurrentQueue<Task> PendingTasks = new();
 
     public string CustomArguments => Metadata["CustomArguments"];
-    public string SourceRepo => Metadata["PrRepo"];
-    public string SourceBranch => Metadata["PrBranch"];
+    public string BaseRepo => Metadata["BaseRepo"];
+    public string BaseBranch => Metadata["BaseBranch"];
+    public string PrRepo => Metadata["PrRepo"];
+    public string PrBranch => Metadata["PrBranch"];
 
     public bool TryGetFlag(string name) => CustomArguments.Contains($"-{name}", StringComparison.OrdinalIgnoreCase);
 
@@ -108,8 +110,10 @@ public async Task RunJobAsync()
             await LogAsync($"{nameof(Environment.CurrentDirectory)}={Environment.CurrentDirectory}");
             await LogAsync($"{nameof(RuntimeInformation.FrameworkDescription)}={RuntimeInformation.FrameworkDescription}");
             await LogAsync($"{nameof(RuntimeInformation.RuntimeIdentifier)}={RuntimeInformation.RuntimeIdentifier}");
-            await LogAsync($"{nameof(SourceRepo)}={SourceRepo}");
-            await LogAsync($"{nameof(SourceBranch)}={SourceBranch}");
+            await LogAsync($"{nameof(BaseRepo)}={BaseRepo}");
+            await LogAsync($"{nameof(BaseBranch)}={BaseBranch}");
+            await LogAsync($"{nameof(PrRepo)}={PrRepo}");
+            await LogAsync($"{nameof(PrBranch)}={PrBranch}");
 
             Console.WriteLine($"Starting {Metadata["JobType"]} ({Metadata["ExternalId"]}) ...");
 
diff --git a/Runner/Jobs/RebaseJob.cs b/Runner/Jobs/RebaseJob.cs
index 3a3bb46..4007908 100644
--- a/Runner/Jobs/RebaseJob.cs
+++ b/Runner/Jobs/RebaseJob.cs
@@ -19,9 +19,9 @@ cd runtime
             git log -1
             git config --global user.email mihubot@mihubot.xyz
             git config --global user.name MihuBot
-            git remote add pr https://MihuBot:{{pushToken}}@github.com/{{SourceRepo}}.git
-            git fetch pr {{SourceBranch}}
-            git checkout {{SourceBranch}}
+            git remote add pr https://MihuBot:{{pushToken}}@github.com/{{PrRepo}}.git
+            git fetch pr {{PrBranch}}
+            git checkout {{PrBranch}}
             git log -1
             """,
             line => line.Replace(pushToken, "<REDACTED>", StringComparison.OrdinalIgnoreCase));