diff --git a/src/Command/ExportCommand.php b/src/Command/ExportCommand.php
index ae42345..98cb83b 100644
--- a/src/Command/ExportCommand.php
+++ b/src/Command/ExportCommand.php
@@ -62,6 +62,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
           ));
       }
     }
+    return 0;
   }
 
 }
diff --git a/src/Command/RunCommand.php b/src/Command/RunCommand.php
index 4bbf2e8..34b752d 100644
--- a/src/Command/RunCommand.php
+++ b/src/Command/RunCommand.php
@@ -41,6 +41,7 @@ protected function execute(InputInterface $input, OutputInterface $output) {
     else {
       $this->executeInManagedMode($input, $output);
     }
+    return 0;
   }
 
   /**