diff --git a/mailing-lists.html b/mailing-lists.html
index 04c06ad05..3ce57afe2 100644
--- a/mailing-lists.html
+++ b/mailing-lists.html
@@ -42,7 +42,7 @@
          <li><form method="get" action="http://sourceforge.net/p/cc65/mailman/search">Search
                <input type="text" name="q" maxlength="255"/>
                <input type="hidden" name="mail_list" value="cc65-devel"/>
-               <input type="submit" value="SourceForge Search"/>
+               <input type="submit" name="s" value="SourceForge Search"/>
              </form>
          </li>
        </ul>
@@ -61,7 +61,7 @@
          <li><form method="get" action="http://sourceforge.net/p/cc65/mailman/search">Search
                <input type="text" name="q" maxlength="255"/>
                <input type="hidden" name="mail_list" value="cc65-git"/>
-               <input type="submit" value="SourceForge Search"/>
+               <input type="submit" name="s" value="SourceForge Search"/>
              </form>
          </li>
        </ul>
@@ -75,7 +75,7 @@
          <li><form method="get" action="http://www.google.com/search">Search
                <input type="text" name="q" maxlength="255"/>
                <input type="hidden" name="sitesearch" value="http://cc65.github.io/mailarchive"/>
-               <input type="submit" value="Google Search"/>
+               <input type="submit" name="s" value="Google Search"/>
              </form>
          </li>
        </ul>