diff --git a/src/gui/qt/joinnetworkgamedialog.ui b/src/gui/qt/joinnetworkgamedialog.ui
index 349967d3..b2b3326b 100644
--- a/src/gui/qt/joinnetworkgamedialog.ui
+++ b/src/gui/qt/joinnetworkgamedialog.ui
@@ -131,7 +131,14 @@
        </widget>
       </item>
       <item row="1" column="4" >
-       <widget class="QSpinBox" name="spinBox_port" />
+       <widget class="QSpinBox" name="spinBox_port" >
+        <property name="maximum" >
+         <number>65535</number>
+        </property>
+        <property name="minimum" >
+         <number>1024</number>
+        </property>
+       </widget>
       </item>
       <item row="1" column="3" >
        <widget class="QLabel" name="label_2" >