diff --git a/src/Index/GlobalIndex.php b/src/Index/GlobalIndex.php
index e1e6d48..f9f5300 100644
--- a/src/Index/GlobalIndex.php
+++ b/src/Index/GlobalIndex.php
@@ -26,6 +26,7 @@ class GlobalIndex extends AbstractAggregateIndex
     {
         $this->stubsIndex = $stubsIndex;
         $this->projectIndex = $projectIndex;
+        parent::__construct();
     }
 
     /**
diff --git a/src/Index/ProjectIndex.php b/src/Index/ProjectIndex.php
index aa31b21..8adc938 100644
--- a/src/Index/ProjectIndex.php
+++ b/src/Index/ProjectIndex.php
@@ -26,6 +26,7 @@ class ProjectIndex extends AbstractAggregateIndex
     {
         $this->sourceIndex = $sourceIndex;
         $this->dependenciesIndex = $dependenciesIndex;
+        parent::__construct();
     }
 
     /**