Index: src/main/java/org/perf4j/servlet/AbstractGraphingServlet.java
===================================================================
--- src/main/java/org/perf4j/servlet/AbstractGraphingServlet.java	(revision 97)
+++ src/main/java/org/perf4j/servlet/AbstractGraphingServlet.java	(working copy)
@@ -58,6 +58,8 @@
     protected void doGet(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         Map<String, StatisticsChartGenerator> chartsByName = getChartGeneratorsToDisplay(request);
+        
+        response.setContentType("text/html;charset=utf-8");
 
         writeHeader(request, response);
         for (Map.Entry<String, StatisticsChartGenerator> nameAndChart : chartsByName.entrySet()) {