diff --git a/.changeset/smart-items-fry.md b/.changeset/smart-items-fry.md
new file mode 100644
index 0000000000..06ddd08979
--- /dev/null
+++ b/.changeset/smart-items-fry.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Fix broken GitHub PR action due to malformed `repoUrl`
diff --git a/plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/githubPullRequest.ts b/plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/githubPullRequest.ts
index 9efc11210a..e4458508ef 100644
--- a/plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/githubPullRequest.ts
+++ b/plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/githubPullRequest.ts
@@ -72,7 +72,7 @@ export const defaultClientFactory = async ({
   const octokitOptions = await getOctokitOptions({
     integrations,
     credentialsProvider: githubCredentialsProvider,
-    repoUrl: `https://${encodedHost}/${encodedOwner}/${encodedRepo}`,
+    repoUrl: `${encodedHost}?owner=${encodedOwner}&repo=${encodedRepo}`,
     token: providedToken,
   });