diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
index 8eddd8507028..fe9002fe47f5 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
@@ -282,7 +282,7 @@ private function round($number)
                     break;
             }
 
-            $number /= $roundingCoef;
+            $number = 1 === $roundingCoef ? (int) $number : $number / $roundingCoef;
         }
 
         return $number;
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
index 30b93c66feb5..fc76f9b53e39 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
@@ -370,7 +370,7 @@ public function testReverseTransformWithRounding($scale, $input, $output, $round
     {
         $transformer = new NumberToLocalizedStringTransformer($scale, null, $roundingMode);
 
-        $this->assertEquals($output, $transformer->reverseTransform($input));
+        $this->assertSame($output, $transformer->reverseTransform($input));
     }
 
     public function testReverseTransformDoesNotRoundIfNoScale()