diff --git a/extensions/git/src/repository.ts b/extensions/git/src/repository.ts
index 3ef39573c56d..168384c0979b 100644
--- a/extensions/git/src/repository.ts
+++ b/extensions/git/src/repository.ts
@@ -317,6 +317,7 @@ function isReadOnly(operation: Operation): boolean {
 		case Operation.GetCommitTemplate:
 		case Operation.CheckIgnore:
 		case Operation.GetObjectDetails:
+		case Operation.MergeBase:
 			return true;
 		default:
 			return false;