diff --git a/config/nimdoc.cfg b/config/nimdoc.cfg
index eafc88b4e3..abe039738f 100644
--- a/config/nimdoc.cfg
+++ b/config/nimdoc.cfg
@@ -147,7 +147,7 @@ doc.body_toc_group = """
       <ul class="simple-boot">
         <li><a href="manual.html">Manual</a></li>
         <li><a href="lib.html">Standard library</a></li>
-        <li> <a href="$theindexhref">Index</a></li>
+        <li> <a id="indexLink" href="$theindexhref">Index</a></li>
         <li><a href="compiler/$theindexhref">Compiler docs</a></li>
         <li><a href="https://nim-lang.github.io/fusion/theindex.html">Fusion docs</a></li>
         <li><a href="https://nim-lang.github.io/Nim/">devel</a>, <a href="https://nim-lang.org/documentation.html">stable</a></li>
@@ -185,7 +185,7 @@ doc.body_toc_group = """
     </div>
     <div id="global-links">
       <ul class="simple">
-        <li><a href="$theindexhref">Index</a></li>
+        <li><a id="indexLink" href="$theindexhref">Index</a></li>
       </ul>
     </div>
     <div id="searchInputDiv">
diff --git a/nimdoc/rst2html/expected/rst_examples.html b/nimdoc/rst2html/expected/rst_examples.html
index 210dbce4e3..72f6453f25 100644
--- a/nimdoc/rst2html/expected/rst_examples.html
+++ b/nimdoc/rst2html/expected/rst_examples.html
@@ -33,7 +33,7 @@
     </div>
     <div id="global-links">
       <ul class="simple">
-        <li><a href="theindex.html">Index</a></li>
+        <li><a id="indexLink" href="theindex.html">Index</a></li>
       </ul>
     </div>
     <div id="searchInputDiv">
diff --git a/nimdoc/test_doctype/expected/test_doctype.html b/nimdoc/test_doctype/expected/test_doctype.html
index 6e81ffd9d1..01ad6e5a09 100644
--- a/nimdoc/test_doctype/expected/test_doctype.html
+++ b/nimdoc/test_doctype/expected/test_doctype.html
@@ -33,7 +33,7 @@
     </div>
     <div id="global-links">
       <ul class="simple">
-        <li><a href="theindex.html">Index</a></li>
+        <li><a id="indexLink" href="theindex.html">Index</a></li>
       </ul>
     </div>
     <div id="searchInputDiv">
diff --git a/nimdoc/test_out_index_dot_html/expected/index.html b/nimdoc/test_out_index_dot_html/expected/index.html
index e5148d1a30..22d5daa358 100644
--- a/nimdoc/test_out_index_dot_html/expected/index.html
+++ b/nimdoc/test_out_index_dot_html/expected/index.html
@@ -33,7 +33,7 @@
     </div>
     <div id="global-links">
       <ul class="simple">
-        <li><a href="theindex.html">Index</a></li>
+        <li><a id="indexLink" href="theindex.html">Index</a></li>
       </ul>
     </div>
     <div id="searchInputDiv">
diff --git a/nimdoc/testproject/expected/subdir/subdir_b/utils.html b/nimdoc/testproject/expected/subdir/subdir_b/utils.html
index f48c5edc2b..7d59e9e860 100644
--- a/nimdoc/testproject/expected/subdir/subdir_b/utils.html
+++ b/nimdoc/testproject/expected/subdir/subdir_b/utils.html
@@ -33,7 +33,7 @@
     </div>
     <div id="global-links">
       <ul class="simple">
-        <li><a href="../../theindex.html">Index</a></li>
+        <li><a id="indexLink" href="../../theindex.html">Index</a></li>
       </ul>
     </div>
     <div id="searchInputDiv">
diff --git a/nimdoc/testproject/expected/testproject.html b/nimdoc/testproject/expected/testproject.html
index f6bd56aa60..4caff7ec77 100644
--- a/nimdoc/testproject/expected/testproject.html
+++ b/nimdoc/testproject/expected/testproject.html
@@ -33,7 +33,7 @@
     </div>
     <div id="global-links">
       <ul class="simple">
-        <li><a href="theindex.html">Index</a></li>
+        <li><a id="indexLink" href="theindex.html">Index</a></li>
       </ul>
     </div>
     <div id="searchInputDiv">
diff --git a/tools/dochack/dochack.nim b/tools/dochack/dochack.nim
index 1a5c86253b..4067d2ed44 100644
--- a/tools/dochack/dochack.nim
+++ b/tools/dochack/dochack.nim
@@ -255,7 +255,7 @@ proc dosearch(value: cstring): Element =
     var stuff: Element
     {.emit: """
     var request = new XMLHttpRequest();
-    request.open("GET", "theindex.html", false);
+    request.open("GET", document.getElementById("indexLink").href, false);
     request.send(null);
 
     var doc = document.implementation.createHTMLDocument("theindex");