diff --git a/gtk/dscp_settings.ui b/gtk/dscp_settings.ui
index 4664768c6..22679a49b 100644
--- a/gtk/dscp_settings.ui
+++ b/gtk/dscp_settings.ui
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <requires lib="gtk+" version="2.24"/>
+  <requires lib="gtk+" version="2.18"/>
   <!-- interface-naming-policy project-wide -->
   <object class="GtkDialog" id="dscp_settings">
     <property name="can_focus">False</property>