diff --git a/src/Psalm/Internal/PluginManager/Command/DisableCommand.php b/src/Psalm/Internal/PluginManager/Command/DisableCommand.php
index 1ca8a82b7..2379332f1 100644
--- a/src/Psalm/Internal/PluginManager/Command/DisableCommand.php
+++ b/src/Psalm/Internal/PluginManager/Command/DisableCommand.php
@@ -45,7 +45,7 @@ class DisableCommand extends Command
     }
 
     /**
-     * @return null|int
+     * @return int
      */
     protected function execute(InputInterface $i, OutputInterface $o)
     {
@@ -80,5 +80,7 @@ class DisableCommand extends Command
 
         $plugin_list->disable($plugin_class);
         $io->success('Plugin disabled');
+
+        return 0;
     }
 }
diff --git a/src/Psalm/Internal/PluginManager/Command/EnableCommand.php b/src/Psalm/Internal/PluginManager/Command/EnableCommand.php
index 9d53fb1ae..56bb908f2 100644
--- a/src/Psalm/Internal/PluginManager/Command/EnableCommand.php
+++ b/src/Psalm/Internal/PluginManager/Command/EnableCommand.php
@@ -45,7 +45,7 @@ class EnableCommand extends Command
     }
 
     /**
-     * @return null|int
+     * @return int
      */
     protected function execute(InputInterface $i, OutputInterface $o)
     {
@@ -80,5 +80,7 @@ class EnableCommand extends Command
 
         $plugin_list->enable($plugin_class);
         $io->success('Plugin enabled');
+
+        return 0;
     }
 }
diff --git a/src/Psalm/Internal/PluginManager/Command/ShowCommand.php b/src/Psalm/Internal/PluginManager/Command/ShowCommand.php
index d8c036a3d..f8b340432 100644
--- a/src/Psalm/Internal/PluginManager/Command/ShowCommand.php
+++ b/src/Psalm/Internal/PluginManager/Command/ShowCommand.php
@@ -40,7 +40,7 @@ class ShowCommand extends Command
     }
 
     /**
-     * @return null|int
+     * @return int
      */
     protected function execute(InputInterface $i, OutputInterface $o)
     {
@@ -90,5 +90,7 @@ class ShowCommand extends Command
         } else {
             $io->note('No plugins available');
         }
+
+        return 0;
     }
 }