diff --git a/src/Compiler.php b/src/Compiler.php
index f8dd61c..53f81dc 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -28,6 +28,7 @@ public function compile(AbstractModule $module, string $scriptDir): Scripts
         // Compile dependencies
         $compileVisitor = new CompileVisitor($container);
         $container->map(static function (DependencyInterface $dependency, string $key) use ($scripts, $compileVisitor): DependencyInterface {
+            assert($dependency instanceof AcceptInterface);
             $script = $dependency->accept($compileVisitor);
             assert(is_string($script));
             $scripts->add($key, $script);