diff --git a/src/Extension/Extension.php b/src/Extension/Extension.php
index ec12b0f040..de5e5f30dd 100644
--- a/src/Extension/Extension.php
+++ b/src/Extension/Extension.php
@@ -218,7 +218,6 @@ public function calculateDependencies($extensionSet, $enabledIds)
     {
         $this->extensionDependencyIds = (new Collection(Arr::get($this->composerJson, 'require', [])))
             ->keys()
-            ->merge(Arr::get($this->composerJson, 'extra.flarum-extension.optional-dependencies', []))
             ->filter(function ($key) use ($extensionSet) {
                 return array_key_exists($key, $extensionSet);
             })