diff --git a/src/vs/sessions/contrib/chat/browser/branchPicker.ts b/src/vs/sessions/contrib/chat/browser/branchPicker.ts
deleted file mode 100644
index a4a092d8349..00000000000
--- a/src/vs/sessions/contrib/chat/browser/branchPicker.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
diff --git a/src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts b/src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts
index 9990b803d50..a2ce751d408 100644
--- a/src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts
+++ b/src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts
@@ -235,9 +235,9 @@ export class CopilotCLISession extends Disposable implements ISessionData {
 				.filter((name): name is string => !!name)
 				.filter(name => !name.includes(CopilotCLISession.COPILOT_WORKTREE_PATTERN));
 
-			const defaultBranch = branches.find(b => b === repo.state.get().HEAD?.name)
-				?? branches.find(b => b === 'main')
+			const defaultBranch = branches.find(b => b === 'main')
 				?? branches.find(b => b === 'master')
+				?? branches.find(b => b === repo.state.get().HEAD?.name)
 				?? branches[0];
 
 			this._defaultBranch = defaultBranch;