diff --git a/DependencyInjection/AbstractDoctrineExtension.php b/DependencyInjection/AbstractDoctrineExtension.php
index 8dab9c8a..db15a8d5 100644
--- a/DependencyInjection/AbstractDoctrineExtension.php
+++ b/DependencyInjection/AbstractDoctrineExtension.php
@@ -465,7 +465,7 @@ private function validateAutoMapping(array $managerConfigs)
             }
 
             if (null !== $autoMappedManager) {
-                throw new \LogicException(sprintf('You cannot enable "auto_mapping" on more than one manager at the same time (found in "%s" and %s").', $autoMappedManager, $name));
+                throw new \LogicException(sprintf('You cannot enable "auto_mapping" on more than one manager at the same time (found in "%s" and "%s"").', $autoMappedManager, $name));
             }
 
             $autoMappedManager = $name;
diff --git a/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php b/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php
index 4dccb297..786bb925 100644
--- a/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php
+++ b/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPass.php
@@ -68,7 +68,7 @@ private function addTaggedSubscribers(ContainerBuilder $container)
             $connections = isset($tag['connection']) ? [$tag['connection']] : array_keys($this->connections);
             foreach ($connections as $con) {
                 if (!isset($this->connections[$con])) {
-                    throw new RuntimeException(sprintf('The Doctrine connection "%s" referenced in service "%s" does not exist. Available connections names: %s.', $con, $id, implode(', ', array_keys($this->connections))));
+                    throw new RuntimeException(sprintf('The Doctrine connection "%s" referenced in service "%s" does not exist. Available connections names: "%s".', $con, $id, implode('", "', array_keys($this->connections))));
                 }
 
                 $this->getEventManagerDef($container, $con)->addMethodCall('addEventSubscriber', [new Reference($id)]);
@@ -91,7 +91,7 @@ private function addTaggedListeners(ContainerBuilder $container)
             $connections = isset($tag['connection']) ? [$tag['connection']] : array_keys($this->connections);
             foreach ($connections as $con) {
                 if (!isset($this->connections[$con])) {
-                    throw new RuntimeException(sprintf('The Doctrine connection "%s" referenced in service "%s" does not exist. Available connections names: %s.', $con, $id, implode(', ', array_keys($this->connections))));
+                    throw new RuntimeException(sprintf('The Doctrine connection "%s" referenced in service "%s" does not exist. Available connections names: "%s".', $con, $id, implode('", "', array_keys($this->connections))));
                 }
 
                 if ($lazy = !empty($tag['lazy'])) {
diff --git a/Tests/PropertyInfo/Fixtures/DoctrineFooType.php b/Tests/PropertyInfo/Fixtures/DoctrineFooType.php
index b851aee6..3d86eea5 100644
--- a/Tests/PropertyInfo/Fixtures/DoctrineFooType.php
+++ b/Tests/PropertyInfo/Fixtures/DoctrineFooType.php
@@ -50,7 +50,7 @@ public function convertToDatabaseValue($value, AbstractPlatform $platform)
             return null;
         }
         if (!$value instanceof Foo) {
-            throw new ConversionException(sprintf('Expected %s, got %s', 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\Foo', \gettype($value)));
+            throw new ConversionException(sprintf('Expected "%s", got "%s"', 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\Foo', \gettype($value)));
         }
 
         return $foo->bar;