diff --git a/src/main/scala/gitbucket/core/servlet/AccessTokenAuthenticationFilter.scala b/src/main/scala/gitbucket/core/servlet/AccessTokenAuthenticationFilter.scala
index 7cc3754..a3d019b 100644
--- a/src/main/scala/gitbucket/core/servlet/AccessTokenAuthenticationFilter.scala
+++ b/src/main/scala/gitbucket/core/servlet/AccessTokenAuthenticationFilter.scala
@@ -33,7 +33,7 @@
       case None => chain.doFilter(req, res)
       case Some(Left(_)) => {
         response.setStatus(HttpServletResponse.SC_UNAUTHORIZED)
-        response.setContentType("Content-Type: application/json; charset=utf-8")
+        response.setContentType("application/json; charset=utf-8")
         val w = response.getWriter()
         w.print("""{ "message": "Bad credentials" }""")
         w.close()