diff --git a/core/includes/common.inc b/core/includes/common.inc
index 08ce2abbc08..353a9b51d8c 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3518,7 +3518,13 @@ function drupal_build_css_cache($css) {
   $data = '';
   $uri = '';
   $map = variable_get('drupal_css_cache_files', array());
-  $key = hash('sha256', serialize($css));
+  // Create a new array so that only the file names are used to create the hash.
+  // This prevents new aggregates from being created unnecessarily.
+  $css_data = array();
+  foreach ($css as $css_file) {
+    $css_data[] = $css_file['data'];
+  }
+  $key = hash('sha256', serialize($css_data));
   if (isset($map[$key])) {
     $uri = $map[$key];
   }
@@ -5020,7 +5026,13 @@ function drupal_build_js_cache($files) {
   $contents = '';
   $uri = '';
   $map = variable_get('drupal_js_cache_files', array());
-  $key = hash('sha256', serialize($files));
+  // Create a new array so that only the file names are used to create the hash.
+  // This prevents new aggregates from being created unnecessarily.
+  $js_data = array();
+  foreach ($files as $file) {
+    $js_data[] = $file['data'];
+  }
+  $key = hash('sha256', serialize($js_data));
   if (isset($map[$key])) {
     $uri = $map[$key];
   }
diff --git a/core/modules/system/tests/common.test b/core/modules/system/tests/common.test
index 0380b6ebb44..f0ac957ef22 100644
--- a/core/modules/system/tests/common.test
+++ b/core/modules/system/tests/common.test
@@ -1423,6 +1423,48 @@ class CommonJavaScriptTestCase extends DrupalWebTestCase {
     $this->assertTrue(strpos($javascript, $expected) > 0, t('JavaScript is aggregated in the expected groups and order.'));
   }
 
+  /**
+   * Tests JavaScript aggregation when files are added to a different scope.
+   */
+  function testAggregationOrder() {
+    // Enable JavaScript aggregation.
+    config('system.performance')->set('preprocess_js', 1)->save();
+    drupal_static_reset('drupal_add_js');
+
+    // Add two JavaScript files to the current request and build the cache.
+    drupal_add_js('core/misc/ajax.js');
+    drupal_add_js('core/misc/autocomplete.js');
+
+    $js_items = drupal_add_js();
+    drupal_build_js_cache(array(
+      'core/misc/ajax.js' => $js_items['core/misc/ajax.js'],
+      'core/misc/autocomplete.js' => $js_items['core/misc/autocomplete.js']
+    ));
+
+    // Store the expected key for the first item in the cache.
+    $cache = array_keys(variable_get('drupal_js_cache_files', array()));
+    $expected_key = $cache[0];
+
+    // Reset variables and add a file in a different scope first.
+    variable_del('drupal_js_cache_files');
+    drupal_static_reset('drupal_add_js');
+    drupal_add_js('some/custom/javascript_file.js', array('scope' => 'footer'));
+    drupal_add_js('core/misc/ajax.js');
+    drupal_add_js('core/misc/autocomplete.js');
+
+    // Rebuild the cache.
+    $js_items = drupal_add_js();
+    drupal_build_js_cache(array(
+      'core/misc/ajax.js' => $js_items['core/misc/ajax.js'],
+      'core/misc/autocomplete.js' => $js_items['core/misc/autocomplete.js']
+    ));
+
+    // Compare the expected key for the first file to the current one.
+    $cache = array_keys(variable_get('drupal_js_cache_files', array()));
+    $key = $cache[0];
+    $this->assertEqual($key, $expected_key, 'JavaScript aggregation is not affected by ordering in different scopes.');
+  }
+
   /**
    * Test JavaScript ordering.
    */