diff --git a/core/src/main/java/org/apache/struts2/dispatcher/Dispatcher.java b/core/src/main/java/org/apache/struts2/dispatcher/Dispatcher.java
index 93632fa12..dcc5fe72a 100644
--- a/core/src/main/java/org/apache/struts2/dispatcher/Dispatcher.java
+++ b/core/src/main/java/org/apache/struts2/dispatcher/Dispatcher.java
@@ -85,7 +85,7 @@ public class Dispatcher {
      */
     public static final String REQUEST_POST_METHOD = "POST";
 
-    public static final String MULTIPART_FORM_DATA_REGEX = "^multipart/form-data(; boundary=[0-9a-zA-Z'()+_,\\-./:=?]{1,70})?";
+    public static final String MULTIPART_FORM_DATA_REGEX = "^multipart/form-data(; boundary=[0-9a-zA-Z'()+_,\\-./:=?]{1,70})?(;charset=[a-zA-Z\\-0-9]{3,14})?";
 
     /**
      * Provide a thread local instance.
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 5c7252eb5..7e25fb11f 100644
--- a/core/src/test/java/org/apache/struts2/dispatcher/DispatcherTest.java
+++ b/core/src/test/java/org/apache/struts2/dispatcher/DispatcherTest.java
@@ -291,6 +291,36 @@ public class DispatcherTest extends StrutsInternalTestCase {
         assertTrue(du.isMultipartSupportEnabled(req));
     }
 
+    public void testIsMultipartRequest() throws Exception {
+        MockHttpServletRequest req = new MockHttpServletRequest();
+        HttpServletResponse res = new MockHttpServletResponse();
+
+        req.setMethod("POST");
+        Dispatcher du = initDispatcher(Collections.<String, String>emptyMap());
+        du.prepare(req, res);
+
+        req.setContentType("multipart/form-data");
+        assertTrue(du.isMultipartRequest(req));
+
+        req.setContentType("multipart/form-data; boundary=---------------------------207103069210263");
+        assertTrue(du.isMultipartRequest(req));
+
+        req.setContentType("multipart/form-data; boundary=---------------------------207103069210263;charset=UTF-8");
+        assertTrue(du.isMultipartRequest(req));
+
+        req.setContentType("multipart/form-data; boundary=---------------------------207103069210263;charset=ISO-8859-1");
+        assertTrue(du.isMultipartRequest(req));
+
+        req.setContentType("multipart/form-data; boundary=---------------------------207103069210263;charset=Windows-1250");
+        assertTrue(du.isMultipartRequest(req));
+
+        req.setContentType("multipart/form-data; boundary=---------------------------207103069210263;charset=US-ASCII");
+        assertTrue(du.isMultipartRequest(req));
+
+        req.setContentType("multipart/form-data; boundary=---------------------------207103069210263;charset=UTF-16LE");
+        assertTrue(du.isMultipartRequest(req));
+    }
+
     class InternalConfigurationManager extends ConfigurationManager {
     	public boolean destroyConfiguration = false;