diff --git a/unc_display.inc.php b/unc_display.inc.php
index 1924924..bab8698 100644
--- a/unc_display.inc.php
+++ b/unc_display.inc.php
@@ -329,7 +329,7 @@ function unc_display_image_html($file_path, $show_thumb, $file_data = false) {
     $gal_text = '';
     if ($UNC_GALLERY['image_view_method'] == 'photoswipe') {
         global $post;
-        $slug = $post->post_name;
+        $slug = str_replace("-", "_", $post->post_name);
         $gal_text = "onClick=\"unc_g_photoswipe_$slug({$F['index']}); return false;\"";
     } else if ($UNC_GALLERY['image_view_method'] == 'lightbox') {
         $gal_text = "data-lightbox=\"gallery_{$F['file_name']}\"";
@@ -347,7 +347,7 @@ function unc_display_image_html($file_path, $show_thumb, $file_data = false) {
 
 function unc_display_photoswipe_js($files) {
     global $post;
-    $slug = $post->post_name;
+    $slug = str_replace("-", "_", $post->post_name);
     $out = '
 <script type="text/javascript">
     function unc_g_photoswipe_' . $slug . '(index) {