diff --git a/src/Symfony/Component/Config/Definition/VariableNode.php b/src/Symfony/Component/Config/Definition/VariableNode.php
index 0d722c6bd2..0bcb28f233 100644
--- a/src/Symfony/Component/Config/Definition/VariableNode.php
+++ b/src/Symfony/Component/Config/Definition/VariableNode.php
@@ -84,14 +84,13 @@ class VariableNode extends BaseNode implements PrototypeNodeInterface
         // deny environment variables only when using custom validators
         // this avoids ever passing an empty value to final validation closures
         if (!$this->allowEmptyValue && $this->isHandlingPlaceholder() && $this->finalValidationClosures) {
-            @trigger_error(sprintf('Setting path "%s" to an environment variable is deprecated since Symfony 4.3. Remove "cannotBeEmpty()", "validate()" or include a prefix/suffix value instead.', $this->getPath()), E_USER_DEPRECATED);
-//            $e = new InvalidConfigurationException(sprintf('The path "%s" cannot contain an environment variable when empty values are not allowed by definition and are validated.', $this->getPath(), json_encode($value)));
-//            if ($hint = $this->getInfo()) {
-//                $e->addHint($hint);
-//            }
-//            $e->setPath($this->getPath());
-//
-//            throw $e;
+            $e = new InvalidConfigurationException(sprintf('The path "%s" cannot contain an environment variable when empty values are not allowed by definition and are validated.', $this->getPath(), json_encode($value)));
+            if ($hint = $this->getInfo()) {
+                $e->addHint($hint);
+            }
+            $e->setPath($this->getPath());
+
+            throw $e;
         }
 
         if (!$this->allowEmptyValue && $this->isValueEmpty($value)) {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
index 84d6d8db82..bfc4b2c56e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Tests\Compiler;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\Definition\Builder\ParentNodeDefinitionInterface;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass;
@@ -229,13 +230,15 @@ class ValidateEnvPlaceholdersPassTest extends TestCase
     }
 
     /**
-     * NOT LEGACY (test exception in 5.0).
-     *
-     * @group legacy
-     * @expectedDeprecation Setting path "env_extension.scalar_node_not_empty_validated" to an environment variable is deprecated since Symfony 4.3. Remove "cannotBeEmpty()", "validate()" or include a prefix/suffix value instead.
+     * @expectedException \Symfony\Component\Config\Definition\Exception\InvalidConfigurationException
+     * @expectedExceptionMessage The path "env_extension.scalar_node_not_empty_validated" cannot contain an environment variable when empty values are not allowed by definition and are validated.
      */
     public function testEmptyEnvWhichCannotBeEmptyForScalarNodeWithValidation(): void
     {
+        if (!method_exists(ParentNodeDefinitionInterface::class, 'getChildNodeDefinitions')) {
+            $this->markTestSkipped('symfony/config >=5.0 is required.');
+        }
+
         $container = new ContainerBuilder();
         $container->registerExtension($ext = new EnvExtension());
         $container->prependExtensionConfig('env_extension', $expected = [
@@ -243,8 +246,6 @@ class ValidateEnvPlaceholdersPassTest extends TestCase
         ]);
 
         $this->doProcess($container);
-
-        $this->assertSame($expected, $container->resolveEnvPlaceholders($ext->getConfig()));
     }
 
     public function testPartialEnvWhichCannotBeEmptyForScalarNode(): void