diff --git a/includes/common.inc b/includes/common.inc
index e12151f..e4959d6 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -3563,17 +3563,22 @@ function drupal_load_stylesheet($file, $optimize = NULL, $reset_basepath = TRUE)
   if ($basepath && !file_uri_scheme($file)) {
     $file = $basepath . '/' . $file;
   }
+  // Store the parent base path to restore it later.
+  $parent_base_path = $basepath;
+  // Set the current base path to process prossible child imports.
   $basepath = dirname($file);
 
   // Load the CSS stylesheet. We suppress errors because themes may specify
   // stylesheets in their .info file that don't exist in the theme's path,
   // but are merely there to disable certain module CSS files.
+  $content = '';
   if ($contents = @file_get_contents($file)) {
     // Return the processed stylesheet.
-    return drupal_load_stylesheet_content($contents, $_optimize);
+    $content = drupal_load_stylesheet_content($contents, $_optimize);
   }
-
-  return '';
+  // Restore the parent base path as the file and its childen are processed.
+  $basepath = $parent_base_path;
+  return $content;
 }
 
 /**