diff --git a/docs/demo.html b/docs/demo.html
index f55f796..f87c962 100644
--- a/docs/demo.html
+++ b/docs/demo.html
@@ -125,7 +125,7 @@ <h2>Input</h2>
               <select name="hlon"><option>E</option><option>W</option></select>.</ul></ul>
         <button onclick="return fill_output() && false">Screw that!</button>
       </form>
-      <script src="https://cdn.jsdelivr.net/npm/prcoords@1//js/PRCoords.min.js" onerror="this.src='../js/PRCoords.js'"></script>
+      <script src="https://cdn.jsdelivr.net/npm/prcoords@1/js/PRCoords.min.js" onerror="this.src='../js/PRCoords.js'"></script>
 
       <h2>Results</h2>
       <table id="output">