src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/PackageIndexWriter.java

@@ -126,11 +126,11 @@
     protected void addPackagesList(Collection<PackageElement> packages, String text,
             String tableSummary, Content body) {
         Content table = (configuration.isOutputHtml5())
                 ? HtmlTree.TABLE(HtmlStyle.overviewSummary, getTableCaption(new RawHtml(text)))
                 : HtmlTree.TABLE(HtmlStyle.overviewSummary, tableSummary, getTableCaption(new RawHtml(text)));
-        table.addContent(getSummaryTableHeader(packageTableHeader, "col"));
+        table.addContent(getPackageTableHeader().toContent());
         Content tbody = new HtmlTree(HtmlTag.TBODY);
         addPackagesList(packages, tbody);
         table.addContent(tbody);
         Content anchor = getMarkerAnchor(text);
         Content div = HtmlTree.DIV(HtmlStyle.contentContainer, anchor);