diff --git a/portal/templates/portal/teach/materials.html b/portal/templates/portal/teach/materials.html
index bc1d31a3a..acf88ccb7 100644
--- a/portal/templates/portal/teach/materials.html
+++ b/portal/templates/portal/teach/materials.html
@@ -53,7 +53,7 @@ <h2>User Guide</h2>
             <div class="row">
                 <div class="col-sm-6">
                     <h4>Key Stage 1, and Key Stage 2</h4>
-                    <p><a href="{% url 'materials_viewer' pdf_name='introduction_to_coding' %}" onclick='send_event("introduction_to_coding.pdf,"Downloaded");'>Introduction to Coding Guide</a></p>
+                    <p><a href="{% url 'materials_viewer' pdf_name='introduction_to_coding' %}" onclick='send_event("introduction_to_coding.pdf","Downloaded");'>Introduction to Coding Guide</a></p>
                     <p><a href="{% url 'materials_viewer' pdf_name='levels_guide_1-28' %}" onclick='send_event("levels_guide_1-28.pdf","Downloaded");'>Levels Guide (1–28)</a></p>
                     <p><a href="{% url 'materials_viewer' pdf_name='glossary' %}" onclick='send_event("glossary.pdf","Downloaded");'>Glossary</a></p>
                 </div>