diff -Naur xfce4-panel-4.14.0-orig/plugins/pager/pager.c xfce4-panel-4.14.0/plugins/pager/pager.c
--- xfce4-panel-4.14.0-orig/plugins/pager/pager.c	2019-09-04 15:35:31.954681740 +0200
+++ xfce4-panel-4.14.0/plugins/pager/pager.c	2019-09-04 15:39:59.057180601 +0200
@@ -53,8 +53,11 @@
                                                            guint              prop_id,
                                                            const GValue      *value,
                                                            GParamSpec        *pspec);
-static gboolean pager_plugin_scroll_event                 (GtkWidget         *widget,
+static gboolean pager_buttons_scroll_event                (GtkWidget         *widget,
                                                            GdkEventScroll    *event);
+static gboolean pager_plugin_scroll_event                 (GtkWidget         *widget,
+                                                           GdkEventScroll    *event,
+                                                           gpointer           user_data);
 static void     pager_plugin_drag_begin_event             (GtkWidget         *widget,
                                                            GdkDragContext    *context,
                                                            gpointer           user_data);
@@ -141,7 +144,7 @@
   gobject_class->set_property = pager_plugin_set_property;
 
   widget_class = GTK_WIDGET_CLASS (klass);
-  widget_class->scroll_event = pager_plugin_scroll_event;
+  widget_class->scroll_event = pager_buttons_scroll_event;
   widget_class->get_preferred_width = pager_plugin_get_preferred_width;
   widget_class->get_preferred_width_for_height  = pager_plugin_get_preferred_width_for_height;
   widget_class->get_preferred_height = pager_plugin_get_preferred_height;
@@ -318,10 +321,20 @@
 
 
 static gboolean
+pager_buttons_scroll_event (GtkWidget      *widget,
+                            GdkEventScroll *event)
+{
+  pager_plugin_scroll_event(widget, event, XFCE_PAGER_PLUGIN (widget));
+}
+
+
+
+static gboolean
 pager_plugin_scroll_event (GtkWidget      *widget,
-                           GdkEventScroll *event)
+                           GdkEventScroll *event,
+                           gpointer        user_data)
 {
-  PagerPlugin        *plugin = XFCE_PAGER_PLUGIN (widget);
+  PagerPlugin        *plugin = user_data;
   WnckWorkspace      *active_ws;
   WnckWorkspace      *new_ws;
   gint                active_n;
@@ -445,6 +458,9 @@
                               G_CALLBACK (pager_plugin_drag_begin_event), plugin);
       g_signal_connect_after (G_OBJECT (plugin->pager), "drag-end",
                               G_CALLBACK (pager_plugin_drag_end_event), plugin);
+      /* overwrite default WnckPager widget scroll-event */
+      g_signal_connect(G_OBJECT(plugin->pager), "scroll-event",
+                       G_CALLBACK(pager_plugin_scroll_event), plugin);
     }
   else
     {