diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
index 95fea18b4a4a1..90192c059764f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
@@ -691,7 +691,7 @@ private function addAssetsSection(ArrayNodeDefinition $rootNode, callable $enabl
                     ->children()
                         ->booleanNode('strict_mode')
                             ->info('Throw an exception if an entry is missing from the manifest.json')
-                            ->defaultFalse()
+                            ->defaultValue('%kernel.debug%')
                         ->end()
                         ->scalarNode('version_strategy')->defaultNull()->end()
                         ->scalarNode('version')->defaultNull()->end()
@@ -732,7 +732,7 @@ private function addAssetsSection(ArrayNodeDefinition $rootNode, callable $enabl
                                 ->children()
                                     ->booleanNode('strict_mode')
                                         ->info('Throw an exception if an entry is missing from the manifest.json')
-                                        ->defaultFalse()
+                                        ->defaultValue('%kernel.debug%')
                                     ->end()
                                     ->scalarNode('version_strategy')->defaultNull()->end()
                                     ->scalarNode('version')
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/assets.php b/src/Symfony/Bundle/FrameworkBundle/Resources/config/assets.php
index 2457121864afc..2249233b8c1d7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/assets.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/assets.php
@@ -79,7 +79,7 @@
             ->args([
                 abstract_arg('manifest path'),
                 service('http_client')->nullOnInvalid(),
-                false,
+                abstract_arg('strict mode'),
             ])
     ;
 };
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
index 057848db2ba7d..c1b94d2768371 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
@@ -86,7 +86,7 @@ public function testAssetsCanBeEnabled()
             'base_urls' => [],
             'packages' => [],
             'json_manifest_path' => null,
-            'strict_mode' => false,
+            'strict_mode' => '%kernel.debug%',
         ];
 
         $this->assertEquals($defaultConfig, $config['assets']);
@@ -490,7 +490,7 @@ protected static function getBundleDefaultConfig()
                 'base_urls' => [],
                 'packages' => [],
                 'json_manifest_path' => null,
-                'strict_mode' => false,
+                'strict_mode' => '%kernel.debug%',
             ],
             'cache' => [
                 'pools' => [],
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/assets.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/assets.php
index f26621001c9ec..1cb012c6ac27b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/assets.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/assets.php
@@ -29,6 +29,7 @@
             ],
             'remote_manifest' => [
                 'json_manifest_path' => 'https://cdn.example.com/manifest.json',
+                'strict_mode' => false,
             ],
             'var_manifest' => [
                 'json_manifest_path' => '%var_json_manifest_path%',
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/assets.xml b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/assets.xml
index dadee4529d8b5..4e11d8e9fc5c9 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/assets.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/assets.xml
@@ -22,7 +22,7 @@
                 <framework:base-url>https://bar_version_strategy.example.com</framework:base-url>
             </framework:package>
             <framework:package name="json_manifest_strategy" json-manifest-path="/path/to/manifest.json" />
-            <framework:package name="remote_manifest" json-manifest-path="https://cdn.example.com/manifest.json" />
+            <framework:package name="remote_manifest" json-manifest-path="https://cdn.example.com/manifest.json" strict-mode="false" />
             <framework:package name="var_manifest" json-manifest-path="%var_json_manifest_path%" />
             <framework:package name="env_manifest" json-manifest-path="%env(env_manifest)%" />
             <framework:package name="strict_manifest_strategy" json-manifest-path="/path/to/manifest.json" strict-mode="true" />
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/assets.yml b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/assets.yml
index cfd4f07b04346..b28e32fe763fc 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/assets.yml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/assets.yml
@@ -21,6 +21,7 @@ framework:
                 json_manifest_path: '/path/to/manifest.json'
             remote_manifest:
                 json_manifest_path: 'https://cdn.example.com/manifest.json'
+                strict_mode: false
             var_manifest:
                 json_manifest_path: '%var_json_manifest_path%'
             env_manifest:
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
index 045b6ea5f4441..60f3a32538cf8 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
@@ -659,24 +659,25 @@ public function testAssets()
         $versionStrategy = $container->getDefinition((string) $package->getArgument(1));
         $this->assertEquals('assets.json_manifest_version_strategy', $versionStrategy->getParent());
         $this->assertEquals('/path/to/manifest.json', $versionStrategy->getArgument(0));
-        $this->assertFalse($versionStrategy->getArgument(2));
+        $this->assertTrue($versionStrategy->getArgument(2));
 
         $package = $container->getDefinition($packages['remote_manifest']);
         $versionStrategy = $container->getDefinition($package->getArgument(1));
         $this->assertSame('assets.json_manifest_version_strategy', $versionStrategy->getParent());
         $this->assertSame('https://cdn.example.com/manifest.json', $versionStrategy->getArgument(0));
+        $this->assertFalse($versionStrategy->getArgument(2));
 
         $package = $container->getDefinition($packages['var_manifest']);
         $versionStrategy = $container->getDefinition($package->getArgument(1));
         $this->assertSame('assets.json_manifest_version_strategy', $versionStrategy->getParent());
         $this->assertSame('https://cdn.example.com/manifest.json', $versionStrategy->getArgument(0));
-        $this->assertFalse($versionStrategy->getArgument(2));
+        $this->assertTrue($versionStrategy->getArgument(2));
 
         $package = $container->getDefinition($packages['env_manifest']);
         $versionStrategy = $container->getDefinition($package->getArgument(1));
         $this->assertSame('assets.json_manifest_version_strategy', $versionStrategy->getParent());
         $this->assertStringMatchesFormat('env_%s', $versionStrategy->getArgument(0));
-        $this->assertFalse($versionStrategy->getArgument(2));
+        $this->assertTrue($versionStrategy->getArgument(2));
 
         $package = $container->getDefinition((string) $packages['strict_manifest_strategy']);
         $versionStrategy = $container->getDefinition((string) $package->getArgument(1));