diff --git a/djangorota/djangorota/templates/rota/worker_detail.html b/djangorota/djangorota/templates/rota/worker_detail.html
index 74e192e..efe3d1f 100644
--- a/djangorota/djangorota/templates/rota/worker_detail.html
+++ b/djangorota/djangorota/templates/rota/worker_detail.html
@@ -46,7 +46,7 @@
     </div>
   </div>
 
-  {% json_script leaves as worker_leaves_json %}
+  <script id="worker_leaves_json" type="application/json">{{ leaves_json|safe }}</script>
   <script src="{% static 'js/calendar.js' %}"></script>
   <script>
     (function(){
diff --git a/djangorota/rota/views.py b/djangorota/rota/views.py
index 229bc21..b9eb57f 100644
--- a/djangorota/rota/views.py
+++ b/djangorota/rota/views.py
@@ -336,7 +336,13 @@ def worker_detail(request, worker_id):
 	except Exception:
 		leaves = []
 
-	return render(request, "rota/worker_detail.html", {"worker": worker, "form": form, "leaves": leaves})
+	# Provide a JSON-encoded string for safe embedding in the template
+	try:
+		leaves_json = json.dumps(leaves)
+	except Exception:
+		leaves_json = '[]'
+
+	return render(request, "rota/worker_detail.html", {"worker": worker, "form": form, "leaves": leaves, "leaves_json": leaves_json})
 
 
 @require_http_methods(["GET", "POST"])