diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0825ee2c..2d14e91e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,8 @@
 
 ## Unreleased
 
-- Add `kernel.project_dir` to `prefixes` default value to trim paths to the project root (#434) 
+- Add `kernel.project_dir` to `prefixes` default value to trim paths to the project root (#434)
+- Fix `null`, `false` or empty value not disabling Sentry (#454)
 
 ## 4.0.1 (2021-01-26)
 
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index e70f4a9c..5db93fd2 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -29,12 +29,7 @@ public function getConfigTreeBuilder(): TreeBuilder
         $rootNode
             ->children()
                 ->scalarNode('dsn')
-                    ->beforeNormalization()
-                        ->ifTrue(static function ($value): bool {
-                            return empty($value) || (\is_string($value) && '' === trim($value));
-                        })
-                        ->thenUnset()
-                    ->end()
+                    ->info('If this value is not provided, the SDK will try to read it from the SENTRY_DSN environment variable. If that variable also does not exist, the SDK will just not send any events.')
                 ->end()
                 ->booleanNode('register_error_listener')->defaultTrue()->end()
                 ->arrayNode('options')
diff --git a/tests/DependencyInjection/Fixtures/php/empty_dsn.php b/tests/DependencyInjection/Fixtures/php/empty_dsn.php
deleted file mode 100644
index c7ae4027..00000000
--- a/tests/DependencyInjection/Fixtures/php/empty_dsn.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-
-/** @var ContainerBuilder $container */
-$container->loadFromExtension('sentry', [
-    'dsn' => ' ',
-]);
diff --git a/tests/DependencyInjection/Fixtures/xml/empty_dsn.xml b/tests/DependencyInjection/Fixtures/xml/empty_dsn.xml
deleted file mode 100644
index 2f6a61c0..00000000
--- a/tests/DependencyInjection/Fixtures/xml/empty_dsn.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" ?>
-
-<container xmlns="http://symfony.com/schema/dic/services"
-           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-           xmlns:sentry="https://sentry.io/schema/dic/sentry-symfony"
-           xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd
-                               https://sentry.io/schema/dic/sentry-symfony https://sentry.io/schema/dic/sentry-symfony/sentry-1.0.xsd">
-
-    <sentry:config dsn=" " />
-</container>
diff --git a/tests/DependencyInjection/Fixtures/yml/empty_dsn.yml b/tests/DependencyInjection/Fixtures/yml/empty_dsn.yml
deleted file mode 100644
index b79f919d..00000000
--- a/tests/DependencyInjection/Fixtures/yml/empty_dsn.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-sentry:
-    dsn: ' '
diff --git a/tests/DependencyInjection/SentryExtensionTest.php b/tests/DependencyInjection/SentryExtensionTest.php
index 6c848869..3d73facd 100644
--- a/tests/DependencyInjection/SentryExtensionTest.php
+++ b/tests/DependencyInjection/SentryExtensionTest.php
@@ -236,14 +236,6 @@ public function testClentIsCreatedFromOptions(): void
         $this->assertEquals($methodCalls[4][1][0]->getArgument(0), new Reference('sentry.client.options'));
     }
 
-    public function testEmptyDsnIsTreatedAsIfItWasUnset(): void
-    {
-        $container = $this->createContainerFromFixture('empty_dsn');
-        $optionsDefinition = $container->getDefinition('sentry.client.options');
-
-        $this->assertArrayNotHasKey('dsn', $optionsDefinition->getArgument(0));
-    }
-
     public function testErrorTypesOptionIsParsedFromStringToIntegerValue(): void
     {
         $container = $this->createContainerFromFixture('error_types');