diff --git a/UPGRADE-4.2.md b/UPGRADE-4.2.md
index e7382e4b3d..da79da9b3c 100644
--- a/UPGRADE-4.2.md
+++ b/UPGRADE-4.2.md
@@ -55,6 +55,8 @@ Finder
 Form
 ----
 
+ * The `$scale` argument of the `IntegerToLocalizedStringTransformer` is deprecated.
+
  * Deprecated calling `FormRenderer::searchAndRenderBlock` for fields which were already rendered.
    Instead of expecting such calls to return empty strings, check if the field has already been rendered.
 
diff --git a/UPGRADE-5.0.md b/UPGRADE-5.0.md
index 49ec7e39a8..cdcc7d6f18 100644
--- a/UPGRADE-5.0.md
+++ b/UPGRADE-5.0.md
@@ -64,6 +64,11 @@ EventDispatcher
 
  * The `TraceableEventDispatcherInterface` has been removed.
 
+Form
+----
+
+ * The `$scale` argument of the `IntegerToLocalizedStringTransformer` was removed.
+
 Finder
 ------
 
diff --git a/src/Symfony/Component/Form/CHANGELOG.md b/src/Symfony/Component/Form/CHANGELOG.md
index 1f59b5398a..3b6f30db8d 100644
--- a/src/Symfony/Component/Form/CHANGELOG.md
+++ b/src/Symfony/Component/Form/CHANGELOG.md
@@ -4,6 +4,7 @@ CHANGELOG
 4.2.0
 -----
 
+ * deprecated the `$scale` argument of the `IntegerToLocalizedStringTransformer`
  * added `Symfony\Component\Form\ClearableErrorsInterface`
  * deprecated calling `FormRenderer::searchAndRenderBlock` for fields which were already rendered
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php
index 301ead682b..e4f077d277 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php
@@ -22,12 +22,18 @@ class IntegerToLocalizedStringTransformer extends NumberToLocalizedStringTransfo
     /**
      * Constructs a transformer.
      *
-     * @param int  $scale        Unused
      * @param bool $grouping     Whether thousands should be grouped
      * @param int  $roundingMode One of the ROUND_ constants in this class
      */
-    public function __construct(?int $scale = 0, ?bool $grouping = false, int $roundingMode = self::ROUND_DOWN)
+    public function __construct($grouping = false, $roundingMode = self::ROUND_DOWN)
     {
+        if (\is_int($grouping) || \is_bool($roundingMode) || 2 < \func_num_args()) {
+            @trigger_error(sprintf('Passing a precision as the first value to %s::__construct() is deprecated since Symfony 4.2 and support for it will be dropped in 5.0.', __CLASS__), E_USER_DEPRECATED);
+
+            $grouping = $roundingMode;
+            $roundingMode = 2 < \func_num_args() ? func_get_arg(2) : self::ROUND_DOWN;
+        }
+
         parent::__construct(0, $grouping, $roundingMode);
     }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php b/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php
index 4051cbf23d..0fab0eb1be 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/IntegerType.php
@@ -23,12 +23,7 @@ class IntegerType extends AbstractType
      */
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
-        $builder->addViewTransformer(
-            new IntegerToLocalizedStringTransformer(
-                $options['scale'],
-                $options['grouping'],
-                $options['rounding_mode']
-        ));
+        $builder->addViewTransformer(new IntegerToLocalizedStringTransformer($options['grouping'], $options['rounding_mode']));
     }
 
     /**
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
index fe1f7d3179..566d272816 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php
@@ -79,6 +79,18 @@ class IntegerToLocalizedStringTransformerTest extends TestCase
      * @dataProvider transformWithRoundingProvider
      */
     public function testTransformWithRounding($input, $output, $roundingMode)
+    {
+        $transformer = new IntegerToLocalizedStringTransformer(null, $roundingMode);
+
+        $this->assertEquals($output, $transformer->transform($input));
+    }
+
+    /**
+     * @group legacy
+     * @expectedDeprecation Passing a precision as the first value to %s::__construct() is deprecated since Symfony 4.2 and support for it will be dropped in 5.0.
+     * @dataProvider transformWithRoundingProvider
+     */
+    public function testTransformWithRoundingUsingLegacyConstructorSignature($input, $output, $roundingMode)
     {
         $transformer = new IntegerToLocalizedStringTransformer(null, null, $roundingMode);
 
@@ -114,6 +126,25 @@ class IntegerToLocalizedStringTransformerTest extends TestCase
 
         \Locale::setDefault('de_DE');
 
+        $transformer = new IntegerToLocalizedStringTransformer(true);
+
+        $this->assertEquals(1234, $transformer->reverseTransform('1.234,5'));
+        $this->assertEquals(12345, $transformer->reverseTransform('12.345,912'));
+        $this->assertEquals(1234, $transformer->reverseTransform('1234,5'));
+        $this->assertEquals(12345, $transformer->reverseTransform('12345,912'));
+    }
+
+    /**
+     * @group legacy
+     * @expectedDeprecation Passing a precision as the first value to %s::__construct() is deprecated since Symfony 4.2 and support for it will be dropped in 5.0.
+     */
+    public function testReverseTransformWithGroupingUsingLegacyConstructorSignature()
+    {
+        // Since we test against "de_DE", we need the full implementation
+        IntlTestHelper::requireFullIntl($this, false);
+
+        \Locale::setDefault('de_DE');
+
         $transformer = new IntegerToLocalizedStringTransformer(null, true);
 
         $this->assertEquals(1234, $transformer->reverseTransform('1.234,5'));
@@ -177,6 +208,18 @@ class IntegerToLocalizedStringTransformerTest extends TestCase
      * @dataProvider reverseTransformWithRoundingProvider
      */
     public function testReverseTransformWithRounding($input, $output, $roundingMode)
+    {
+        $transformer = new IntegerToLocalizedStringTransformer(null, $roundingMode);
+
+        $this->assertEquals($output, $transformer->reverseTransform($input));
+    }
+
+    /**
+     * @group legacy
+     * @expectedDeprecation Passing a precision as the first value to %s::__construct() is deprecated since Symfony 4.2 and support for it will be dropped in 5.0.
+     * @dataProvider reverseTransformWithRoundingProvider
+     */
+    public function testReverseTransformWithRoundingUsingLegacyConstructorSignature($input, $output, $roundingMode)
     {
         $transformer = new IntegerToLocalizedStringTransformer(null, null, $roundingMode);