diff --git a/src/webui/abstractrequesthandler.cpp b/src/webui/abstractrequesthandler.cpp
index fc9479100..0ec2b73c8 100644
--- a/src/webui/abstractrequesthandler.cpp
+++ b/src/webui/abstractrequesthandler.cpp
@@ -50,7 +50,7 @@ HttpResponse AbstractRequestHandler::run()
   if (isBanned())
   {
     status(403, "Forbidden");
-    print(QObject::tr("Your IP address has been banned after too many failed authentication attempts."));
+    print(QObject::tr("Your IP address has been banned after too many failed authentication attempts."), CONTENT_TYPE_TXT);
   }
   else
   {
diff --git a/src/webui/httptypes.h b/src/webui/httptypes.h
index 614e9a4d2..9eabf577c 100644
--- a/src/webui/httptypes.h
+++ b/src/webui/httptypes.h
@@ -40,12 +40,12 @@ const QString HEADER_CONTENT_TYPE = "Content-Type";
 const QString HEADER_CONTENT_ENCODING = "Content-Encoding";
 const QString HEADER_CONTENT_LENGTH = "Content-Length";
 
-const QString CONTENT_TYPE_CSS = "text/css";
+const QString CONTENT_TYPE_CSS = "text/css; charset=UTF-8";
 const QString CONTENT_TYPE_GIF = "image/gif";
-const QString CONTENT_TYPE_HTML = "text/html";
-const QString CONTENT_TYPE_JS = "text/javascript";
+const QString CONTENT_TYPE_HTML = "text/html; charset=UTF-8";
+const QString CONTENT_TYPE_JS = "text/javascript; charset=UTF-8";
 const QString CONTENT_TYPE_PNG = "image/png";
-const QString CONTENT_TYPE_TXT = "text/plain";
+const QString CONTENT_TYPE_TXT = "text/plain; charset=UTF-8";
 
 struct HttpEnvironment
 {
diff --git a/src/webui/requesthandler.cpp b/src/webui/requesthandler.cpp
index dc4bf0cc8..dea1a42ba 100644
--- a/src/webui/requesthandler.cpp
+++ b/src/webui/requesthandler.cpp
@@ -268,7 +268,7 @@ void RequestHandler::action_command_upload()
     {
       qWarning() << "I/O Error: Could not create temporary file";
       status(500, "Internal Server Error");
-      print(QByteArray("I/O Error: Could not create temporary file."), CONTENT_TYPE_TXT);
+      print(QObject::tr("I/O Error: Could not create temporary file."), CONTENT_TYPE_TXT);
     }
   }
 }