diff --git a/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php b/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php
index cbd36ee771..87c3eeaa89 100644
--- a/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php
+++ b/src/Symfony/Component/Form/Extension/Validator/ValidatorTypeGuesser.php
@@ -220,6 +220,18 @@ class ValidatorTypeGuesser implements FormTypeGuesserInterface
                     array(),
                     Guess::HIGH_CONFIDENCE
                 );
+            case 'Symfony\Component\Validator\Constraints\Size':
+                return new TypeGuess(
+                    'number',
+                    array(),
+                    Guess::LOW_CONFIDENCE
+                );
+            case 'Symfony\Component\Validator\Constraints\SizeLength':
+                return new TypeGuess(
+                    'text',
+                    array(),
+                    Guess::LOW_CONFIDENCE
+                );
         }
     }
 
@@ -269,6 +281,16 @@ class ValidatorTypeGuesser implements FormTypeGuesserInterface
                     strlen((string)$constraint->limit),
                     Guess::HIGH_CONFIDENCE
                 );
+            case 'Symfony\Component\Validator\Constraints\SizeLength':
+                return new ValueGuess(
+                    $constraint->max,
+                    Guess::HIGH_CONFIDENCE
+                );
+            case 'Symfony\Component\Validator\Constraints\Size':
+                return new ValueGuess(
+                    strlen((string)$constraint->max),
+                    Guess::HIGH_CONFIDENCE
+                );
         }
     }
 
@@ -291,6 +313,16 @@ class ValidatorTypeGuesser implements FormTypeGuesserInterface
                     strlen((string)$constraint->limit),
                     Guess::HIGH_CONFIDENCE
                 );
+            case 'Symfony\Component\Validator\Constraints\SizeLength':
+                return new ValueGuess(
+                    $constraint->min,
+                    Guess::HIGH_CONFIDENCE
+                );
+            case 'Symfony\Component\Validator\Constraints\Size':
+                return new ValueGuess(
+                    strlen((string)$constraint->min),
+                    Guess::HIGH_CONFIDENCE
+                );
         }
     }