diff --git a/packages/backend/src/git.ts b/packages/backend/src/git.ts
index 06680ba5..f49207ad 100644
--- a/packages/backend/src/git.ts
+++ b/packages/backend/src/git.ts
@@ -78,6 +78,10 @@ export const fetchRepository = async (
             "--prune",
             "--progress"
         ]);
+
+        if (authHeader) {
+            await git.raw(["config", "--unset", "http.extraHeader", authHeader]);
+        }
     } catch (error: unknown) {
         const baseLog = `Failed to fetch repository: ${path}`;
         if (env.SOURCEBOT_LOG_LEVEL !== "debug") {