diff --git a/src/Configurator/DockerComposeConfigurator.php b/src/Configurator/DockerComposeConfigurator.php
index 9a13906e..5314aa7f 100644
--- a/src/Configurator/DockerComposeConfigurator.php
+++ b/src/Configurator/DockerComposeConfigurator.php
@@ -101,7 +101,7 @@ public static function shouldConfigureDockerRecipe(Composer $composer, IOInterfa
         }
 
         if (null !== $dockerPreference = $composer->getPackage()->getExtra()['symfony']['docker'] ?? null) {
-            self::$configureDockerRecipes = $dockerPreference;
+            self::$configureDockerRecipes = filter_var($dockerPreference, \FILTER_VALIDATE_BOOLEAN);
 
             return self::$configureDockerRecipes;
         }