diff --git a/consts.php b/consts.php
index 53d8c69..3ba697c 100644
--- a/consts.php
+++ b/consts.php
@@ -102,6 +102,12 @@
     'silverstripe-config',
 ];
 
+// Repositories that either don't have a composer type or have a weird composer type, though we still want installer
+const FORCE_INSTALLER_UNLOCKEDSTEPPED_REPOS = [
+    'silverstripe-behat-extension',
+    'silverstripe-serve',
+];
+
 const CMS_TO_REPO_MAJOR_VERSIONS = [
     '4' => [
         'recipe-authoring-tools' => '1',
diff --git a/job_creator.php b/job_creator.php
index 6cb0289..d5d075d 100644
--- a/job_creator.php
+++ b/job_creator.php
@@ -58,7 +58,7 @@ public function getInstallerVersion(): string
                 }
             }
         }
-        if (file_exists($this->composerJsonPath)) {
+        if (file_exists($this->composerJsonPath) && !in_array($this->repoName, FORCE_INSTALLER_UNLOCKEDSTEPPED_REPOS)) {
             $json = json_decode(file_get_contents($this->composerJsonPath));
             // We shouldn't try to infer the installer version for regular repositories
             // that weren't already detected via the const-based logic above
@@ -67,6 +67,7 @@ public function getInstallerVersion(): string
                 'silverstripe-module',
                 'silverstripe-recipe',
                 'silverstripe-theme',
+
             ];
             if (!isset($json->type) || !in_array($json->type, $silverstripeRepoTypes)) {
                 return '';
diff --git a/tests/JobCreatorTest.php b/tests/JobCreatorTest.php
index 7a1fa70..f1c9a50 100644
--- a/tests/JobCreatorTest.php
+++ b/tests/JobCreatorTest.php
@@ -146,6 +146,9 @@ public function provideGetInstallerVersion(): array
             ['myaccount/silverstripe-html5', '2.3', '4.10.x-dev'],
             ['myaccount/silverstripe-html5', '2.4', '4.11.x-dev'],
             ['myaccount/silverstripe-html5', 'burger', $currentMinor],
+            // force installer unlockedstepped repo
+            ['myaccount/silverstripe-serve', '2', $nextMinor],
+            ['myaccount/silverstripe-behat-extension', '2', $nextMinor],
         ];
     }