diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
index 82704a3535..84692aba06 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
@@ -77,7 +77,7 @@ class UniqueEntityValidator extends ConstraintValidator
         $criteria = array();
         foreach ($fields as $fieldName) {
             if (!$class->hasField($fieldName) && !$class->hasAssociation($fieldName)) {
-                throw new ConstraintDefinitionException(sprintf("The field '%s' is not mapped by Doctrine, so it cannot be validated for uniqueness.", $fieldName));
+                throw new ConstraintDefinitionException(sprintf('The field "%s" is not mapped by Doctrine, so it cannot be validated for uniqueness.', $fieldName));
             }
 
             $criteria[$fieldName] = $class->reflFields[$fieldName]->getValue($entity);
diff --git a/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php b/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php
index 1170cb2cc6..3c3410e879 100644
--- a/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php
+++ b/src/Symfony/Component/Intl/DateFormatter/DateFormat/FullTransformer.php
@@ -123,7 +123,7 @@ class FullTransformer
 
         // handle unimplemented characters
         if (false !== strpos($this->notImplementedChars, $dateChars[0])) {
-            throw new NotImplementedException(sprintf("Unimplemented date character '%s' in format '%s'", $dateChars[0], $this->pattern));
+            throw new NotImplementedException(sprintf('Unimplemented date character "%s" in format "%s"', $dateChars[0], $this->pattern));
         }
     }
 
diff --git a/src/Symfony/Component/Routing/Annotation/Route.php b/src/Symfony/Component/Routing/Annotation/Route.php
index 93569d6f62..4a5370b38b 100644
--- a/src/Symfony/Component/Routing/Annotation/Route.php
+++ b/src/Symfony/Component/Routing/Annotation/Route.php
@@ -53,7 +53,7 @@ class Route
         foreach ($data as $key => $value) {
             $method = 'set'.str_replace('_', '', $key);
             if (!method_exists($this, $method)) {
-                throw new \BadMethodCallException(sprintf("Unknown property '%s' on annotation '%s'.", $key, get_class($this)));
+                throw new \BadMethodCallException(sprintf('Unknown property "%s" on annotation "%s".', $key, get_class($this)));
             }
             $this->$method($value);
         }
diff --git a/src/Symfony/Component/Security/Http/Firewall/DigestAuthenticationListener.php b/src/Symfony/Component/Security/Http/Firewall/DigestAuthenticationListener.php
index 27370694d9..a88250bff3 100644
--- a/src/Symfony/Component/Security/Http/Firewall/DigestAuthenticationListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/DigestAuthenticationListener.php
@@ -101,7 +101,7 @@ class DigestAuthenticationListener implements ListenerInterface
 
         if ($serverDigestMd5 !== $digestAuth->getResponse()) {
             if (null !== $this->logger) {
-                $this->logger->debug(sprintf("Expected response: '%s' but received: '%s'; is AuthenticationDao returning clear text passwords?", $serverDigestMd5, $digestAuth->getResponse()));
+                $this->logger->debug(sprintf('Expected response: "%s" but received: "%s"; is AuthenticationDao returning clear text passwords?', $serverDigestMd5, $digestAuth->getResponse()));
             }
 
             $this->fail($event, $request, new BadCredentialsException('Incorrect response'));