diff --git a/main/inc/lib/link.lib.php b/main/inc/lib/link.lib.php
index a0542306f0..d2a1254d44 100755
--- a/main/inc/lib/link.lib.php
+++ b/main/inc/lib/link.lib.php
@@ -1572,14 +1572,11 @@ class Link extends Model
      *
      * @version 1.0
      */
-    public static function is_pdf_link($url)
+    public static function isPdfLink($url)
     {
-        $is_pdf_link = strrpos($url, ".pdf") || strrpos(
-                $url,
-                ".PDF"
-            );
+        $isPdfLink = strrpos(strtolower($url), '.pdf');
 
-        return $is_pdf_link;
+        return $isPdfLink;
     }
 
     /**
diff --git a/main/lp/learnpath.class.php b/main/lp/learnpath.class.php
index 77b2257ddc..1919fd3dbe 100755
--- a/main/lp/learnpath.class.php
+++ b/main/lp/learnpath.class.php
@@ -3666,8 +3666,8 @@ class learnpath
 
                     switch ($lp_item_type) {
                         case 'document':
-                            if(api_get_configuration_value('allow_pdf_viewerjs_in_lp')){
-                                if(Link::is_pdf_link($file)){
+                            if (api_get_configuration_value('allow_pdf_viewerjs_in_lp')) {
+                                if (Link::isPdfLink($file)) {
                                     $pdfUrl = api_get_path(WEB_LIBRARY_PATH).'javascript/ViewerJS/index.html#'.$file;
                                     $file = $pdfUrl;
                                 }