diff --git a/plugins/io.sarl.eclipse/plugin.xml b/plugins/io.sarl.eclipse/plugin.xml
index be0777543a..b725114225 100644
--- a/plugins/io.sarl.eclipse/plugin.xml
+++ b/plugins/io.sarl.eclipse/plugin.xml
@@ -245,6 +245,10 @@
                 name="appName"
                 value="%product.name">
           </property>
+          <property
+	            name="cssTheme"
+	            value="org.eclipse.e4.ui.css.theme.e4_classic">
+	      </property>
        </product>
     </extension>