diff --git a/core/src/test/java/org/apache/struts2/dispatcher/DispatcherTest.java b/core/src/test/java/org/apache/struts2/dispatcher/DispatcherTest.java
index c888c2396..f9d65f35a 100644
--- a/core/src/test/java/org/apache/struts2/dispatcher/DispatcherTest.java
+++ b/core/src/test/java/org/apache/struts2/dispatcher/DispatcherTest.java
@@ -84,7 +84,7 @@ public class DispatcherTest extends StrutsTestCase {
         // given
         MockHttpServletRequest req = new MockHttpServletRequest();
         req.addHeader("X-Requested-With", "XMLHttpRequest");
-        req.setCharacterEncoding("utf-8");
+        req.setCharacterEncoding("UTF-8");
         HttpServletResponse res = new MockHttpServletResponse();
 
         Dispatcher du = initDispatcher(new HashMap<String, String>() {{
@@ -95,7 +95,7 @@ public class DispatcherTest extends StrutsTestCase {
         du.prepare(req, res);
 
         // then
-        assertEquals(req.getCharacterEncoding(), "utf-8");
+        assertEquals(req.getCharacterEncoding(), "UTF-8");
     }
 
     public void testSetEncodingIfDiffer() throws Exception {