diff --git a/src/Indicator.vala b/src/Indicator.vala
index f572e625..86787edb 100644
--- a/src/Indicator.vala
+++ b/src/Indicator.vala
@@ -328,14 +328,16 @@ public class Sound.Indicator : Wingpanel.Indicator {
         display_widget.icon_name = get_volume_icon (volume_control.volume.volume);
     }
 
-    private void on_volume_icon_scroll_event (Gdk.ScrollEvent e) {
+    private void on_volume_icon_scroll_event (Value event_value) {
+        unowned var e = (Gdk.ScrollEvent) event_value.peek_pointer ();
         double dir = 0.0;
         if (handle_scroll_event (e, out dir)) {
             handle_change (dir, false);
         }
     }
 
-    private void on_mic_icon_scroll_event (Gdk.ScrollEvent e) {
+    private void on_mic_icon_scroll_event (Value event_value) {
+        unowned var e = (Gdk.ScrollEvent) event_value.peek_pointer ();
         double dir = 0.0;
         if (handle_scroll_event (e, out dir)) {
             handle_change (dir, true);
@@ -420,7 +422,8 @@ public class Sound.Indicator : Wingpanel.Indicator {
                 volume_control.mic_volume = mic_adjustment.get_value ();
             });
 
-            mic_scale.scroll_event.connect_after ((e) => {
+            mic_scale.scroll_event.connect_after ((event_value) => {
+                unowned var e = (Gdk.ScrollEvent) event_value.peek_pointer ();
                 double dir = 0.0;
                 if (handle_scroll_event (e, out dir)) {
                     handle_change (dir, true);
@@ -443,7 +446,8 @@ public class Sound.Indicator : Wingpanel.Indicator {
 
             volume_scale.slider_dropped.connect (play_volume_change_sound);
 
-            volume_scale.scroll_event.connect_after ((e) => {
+            volume_scale.scroll_event.connect_after ((event_value) => {
+                unowned var e = (Gdk.ScrollEvent) event_value.peek_pointer ();
                 double dir = 0.0;
                 if (handle_scroll_event (e, out dir)) {
                     handle_change (dir, false);
diff --git a/src/Widgets/DisplayWidget.vala b/src/Widgets/DisplayWidget.vala
index 67815bb7..56c13a46 100644
--- a/src/Widgets/DisplayWidget.vala
+++ b/src/Widgets/DisplayWidget.vala
@@ -23,8 +23,11 @@ public class Sound.DisplayWidget : Gtk.Box {
     public bool mic_muted { get; set; }
     public string icon_name { get; set; }
 
-    public signal void volume_scroll_event (Gdk.ScrollEvent e);
-    public signal void mic_scroll_event (Gdk.ScrollEvent e);
+    // HACK: Using Gdk.ScrollEvent instead of Value as the type of the parameter
+    // resulsts build error with valac 0.56.18
+    // See https://gitlab.gnome.org/GNOME/vala/-/work_items/1671
+    public signal void volume_scroll_event (Value event_value);
+    public signal void mic_scroll_event (Value event_value);
 
     construct {
         var volume_icon = new Gtk.Image () {
@@ -50,7 +53,9 @@ public class Sound.DisplayWidget : Gtk.Box {
                 return Gdk.EVENT_PROPAGATE;
             }
 
-            mic_scroll_event ((Gdk.ScrollEvent) e);
+            var event_value = Value (typeof (Gdk.ScrollEvent));
+            event_value.set_instance (e);
+            mic_scroll_event (event_value);
             return Gdk.EVENT_STOP;
         });
 
@@ -60,7 +65,9 @@ public class Sound.DisplayWidget : Gtk.Box {
                 return Gdk.EVENT_PROPAGATE;
             }
 
-            volume_scroll_event ((Gdk.ScrollEvent) e);
+            var event_value = Value (typeof (Gdk.ScrollEvent));
+            event_value.set_instance (e);
+            volume_scroll_event (event_value);
             return Gdk.EVENT_STOP;
         });
 
diff --git a/src/Widgets/Scale.vala b/src/Widgets/Scale.vala
index f3259128..e490b076 100644
--- a/src/Widgets/Scale.vala
+++ b/src/Widgets/Scale.vala
@@ -4,7 +4,10 @@
 */
 
 public class Sound.Widgets.Scale : Granite.Bin {
-    public signal void scroll_event (Gdk.ScrollEvent e);
+    // HACK: Using Gdk.ScrollEvent instead of Value as the type of the parameter
+    // resulsts build error with valac 0.56.18
+    // See https://gitlab.gnome.org/GNOME/vala/-/work_items/1671
+    public signal void scroll_event (Value event_value);
     public signal void slider_dropped ();
 
     public Gtk.Adjustment adjustment { get; construct; }
@@ -52,7 +55,9 @@ public class Sound.Widgets.Scale : Granite.Bin {
                 return Gdk.EVENT_PROPAGATE;
             }
 
-            scroll_event ((Gdk.ScrollEvent) e);
+            var event_value = Value (typeof (Gdk.ScrollEvent));
+            event_value.set_instance (e);
+            scroll_event (event_value);
 
             return Gdk.EVENT_STOP;
         });