diff --git a/src/gui/Window.cc b/src/gui/Window.cc
index 003a664..f0aa2ac 100644
--- a/src/gui/Window.cc
+++ b/src/gui/Window.cc
@@ -205,18 +205,18 @@ void Window::handle_event(Jtk_Event & event)
             break;
         }
         break;
+#endif
 
-    case SDL_MOUSEWHEEL:
-        if (event.wheel.y > 0)
+    case JTK_EVENT_BUTTON_PRESS:
+        if (event.button.button == 4)
         {
             m_focused_buffer_pane->scroll_window_up(ScrollMode::WHEEL);
         }
-        else
+        else if (event.button.button == 5)
         {
             m_focused_buffer_pane->scroll_window_down(ScrollMode::WHEEL);
         }
         break;
-#endif
     }
 }
 
diff --git a/src/gui/jtk/Jtk_event.cc b/src/gui/jtk/Jtk_event.cc
index 966069f..efd39e2 100644
--- a/src/gui/jtk/Jtk_event.cc
+++ b/src/gui/jtk/Jtk_event.cc
@@ -276,6 +276,16 @@ static bool ProcessXKeyReleaseEvent(XEvent * x_event, Jtk_Event * event)
     return false;
 }
 
+/**
+ * Process an X button press event.
+ */
+static bool ProcessXButtonPressEvent(XEvent * x_event, Jtk_Event * event)
+{
+    event->type = JTK_EVENT_BUTTON_PRESS;
+    event->button.button = x_event->xbutton.button;
+    return true;
+}
+
 /**
  * Process an X configure event.
  *
@@ -316,7 +326,7 @@ static bool ProcessXEvent(XEvent * x_event, Jtk_Event * event)
         return ProcessXKeyReleaseEvent(x_event, event);
 
     case ButtonPress:
-        break;
+        return ProcessXButtonPressEvent(x_event, event);
 
     case ButtonRelease:
         break;