diff --git a/src/Symfony/ContainerMeta.php b/src/Symfony/ContainerMeta.php
index fad30b8..a7a635c 100644
--- a/src/Symfony/ContainerMeta.php
+++ b/src/Symfony/ContainerMeta.php
@@ -33,7 +33,7 @@ class ContainerMeta
             if (isset($serviceAttributes->alias)) {
                 $service->setAlias((string) $serviceAttributes->alias);
             }
-            $service->setIsPublic('true' === (string) $serviceAttributes->public);
+            $service->setIsPublic('false' !== (string) $serviceAttributes->public);
 
             $this->add($service);
         }
diff --git a/tests/acceptance/container.xml b/tests/acceptance/container.xml
index 5a3c089..b6ffba6 100644
--- a/tests/acceptance/container.xml
+++ b/tests/acceptance/container.xml
@@ -16,5 +16,6 @@
         <service id="Symfony\Component\HttpKernel\HttpKernelInterface" alias="http_kernel" public="true"/>
         <service id="Foo\Bar" class="Foo\Bar" public="false"/>
         <service id="private_service" class="Foo\Bar" public="false"/>
+        <service id="public_service_wo_public_attr" class="Foo\Bar"/>
     </services>
 </container>
diff --git a/tests/unit/Symfony/ContainerMetaTest.php b/tests/unit/Symfony/ContainerMetaTest.php
index 1a2d2da..dc73f99 100644
--- a/tests/unit/Symfony/ContainerMetaTest.php
+++ b/tests/unit/Symfony/ContainerMetaTest.php
@@ -57,6 +57,11 @@ class ContainerMetaTest extends TestCase
                 'className' => 'Symfony\Component\HttpKernel\HttpKernel',
                 'isPublic' => true,
             ],
+            [
+                'id' => 'public_service_wo_public_attr',
+                'className' => 'Foo\Bar',
+                'isPublic' => true,
+            ],
         ];
     }