diff --git a/lib/Stylesheet.class.php b/lib/Stylesheet.class.php
index 5164632..ad52016 100644
--- a/lib/Stylesheet.class.php
+++ b/lib/Stylesheet.class.php
@@ -82,14 +82,18 @@ public function computeTargetPath()
    */
   protected function configurePath()
   {
-    $target_file =          $this->computeTargetPath();
+    $target_file = $this->computeTargetPath();
     // path to local "wp-content" dir does not match URI in multisite.
-	$wp_content_dir = str_replace(ABSPATH, '', WP_CONTENT_DIR); // get the 'wp-content' part of the path
-	$lessfile_in_theme = preg_replace ('#^.*?' . DIRECTORY_SEPARATOR . $wp_content_dir . DIRECTORY_SEPARATOR . '(.*)$#', '$1', $this->stylesheet->src, 1); // the part after 'wp-content'
-	$this->source_path = WP_CONTENT_DIR  . DIRECTORY_SEPARATOR . $lessfile_in_theme;
-    $this->source_uri =     $this->stylesheet->src;
-    $this->target_path =    self::$upload_dir.$target_file;
-    $this->target_uri =     self::$upload_uri.$target_file;
+    $wp_content_dir = str_replace(ABSPATH, '', WP_CONTENT_DIR); // get the 'wp-content' part of the path
+
+    $stylesheet_separator = str_contains($this->stylesheet->src, '/') ? '/' : '\\';
+    $wp_content_replace_pattern = '#^.*?' . $stylesheet_separator . $wp_content_dir . $stylesheet_separator . '(.*)$#';
+    $lessfile_in_theme = preg_replace ($wp_content_replace_pattern, '$1', $this->stylesheet->src, 1); // the part after 'wp-content'
+
+    $this->source_path = WP_CONTENT_DIR . DIRECTORY_SEPARATOR . $lessfile_in_theme;
+    $this->source_uri =  $this->stylesheet->src;
+    $this->target_path = self::$upload_dir.$target_file;
+    $this->target_uri =  self::$upload_uri.$target_file;
 
     $this->setSourceTimestamp(filemtime($this->source_path));
   }