diff --git a/config/routes b/config/routes
index 96f34c7..fe0f117 100644
--- a/config/routes
+++ b/config/routes
@@ -114,6 +114,7 @@
 /s/#ShrIdent/p/#PrjIdent/t/!new              TicketNewR            GET
 /s/#ShrIdent/p/#PrjIdent/t/#Int              TicketR               GET PUT DELETE POST
 /s/#ShrIdent/p/#PrjIdent/t/#Int/edit         TicketEditR           GET
+/s/#ShrIdent/p/#PrjIdent/t/#Int/accept       TicketAcceptR         POST
 /s/#ShrIdent/p/#PrjIdent/t/#Int/close        TicketCloseR          POST
 /s/#ShrIdent/p/#PrjIdent/t/#Int/open         TicketOpenR           POST
 /s/#ShrIdent/p/#PrjIdent/t/#Int/claim        TicketClaimR          POST
diff --git a/src/Vervis/Foundation.hs b/src/Vervis/Foundation.hs
index 7da9241..eb4f57a 100644
--- a/src/Vervis/Foundation.hs
+++ b/src/Vervis/Foundation.hs
@@ -182,8 +182,9 @@ instance Yesod App where
         (TicketNewR _ _            , _   ) -> personAny
         (TicketR user _ _          , True) -> person user
         (TicketEditR user _ _      , _   ) -> person user
-        (TicketCloseR user _ _     , _   ) -> person user
-        (TicketOpenR user _ _      , _   ) -> person user
+        (TicketAcceptR s j _       , _   ) -> projOp ProjOpAcceptTicket s j
+        (TicketCloseR s j _        , _   ) -> projOp ProjOpCloseTicket s j
+        (TicketOpenR s j _         , _   ) -> projOp ProjOpReopenTicket s j
         (TicketClaimR s j _        , _   ) -> projOp ProjOpClaimTicket s j
         (TicketUnclaimR s j _      , _   ) -> projOp ProjOpUnclaimTicket s j
         (TicketAssignR s j _       , _   ) -> projOp ProjOpAssignTicket s j
@@ -518,6 +519,7 @@ instance YesodBreadcrumbs App where
         TicketEditR shar proj num        -> ( "Edit"
                                             , Just $ TicketR shar proj num
                                             )
+        TicketAcceptR _shr _prj _num     -> ("", Nothing)
         TicketCloseR _shar _proj _num    -> ("", Nothing)
         TicketOpenR _shar _proj _num     -> ("", Nothing)
         TicketClaimR _shar _proj _num    -> ("", Nothing)
diff --git a/src/Vervis/Handler/Ticket.hs b/src/Vervis/Handler/Ticket.hs
index 95b1e4b..df272cc 100644
--- a/src/Vervis/Handler/Ticket.hs
+++ b/src/Vervis/Handler/Ticket.hs
@@ -23,6 +23,7 @@ module Vervis.Handler.Ticket
     , deleteTicketR
     , postTicketR
     , getTicketEditR
+    , postTicketAcceptR
     , postTicketCloseR
     , postTicketOpenR
     , postTicketClaimR
@@ -323,6 +324,24 @@ getTicketEditR shar proj num = do
         runFormPost $ editTicketContentForm tid ticket wid
     defaultLayout $(widgetFile "ticket/edit")
 
+postTicketAcceptR :: ShrIdent -> PrjIdent -> Int -> Handler Html
+postTicketAcceptR shr prj num = do
+    succ <- runDB $ do
+        Entity tid ticket <- do
+            Entity s _ <- getBy404 $ UniqueSharer shr
+            Entity p _ <- getBy404 $ UniqueProject prj s
+            getBy404 $ UniqueTicket p num
+        case ticketStatus ticket of
+            TSNew -> do
+                update tid [TicketStatus =. TSTodo]
+                return True
+            _ -> return False
+    setMessage $
+        if succ
+            then "Ticket accepted."
+            else "Ticket is already accepted."
+    redirect $ TicketR shr prj num
+
 postTicketCloseR :: ShrIdent -> PrjIdent -> Int -> Handler Html
 postTicketCloseR shr prj num = do
     pid <- requireAuthId
diff --git a/src/Vervis/Model/Role.hs b/src/Vervis/Model/Role.hs
index 730de6e..4103f69 100644
--- a/src/Vervis/Model/Role.hs
+++ b/src/Vervis/Model/Role.hs
@@ -28,7 +28,10 @@ data RepoOperation = RepoOpPush deriving (Eq, Show, Read, Enum, Bounded)
 derivePersistField "RepoOperation"
 
 data ProjectOperation
-    = ProjOpRequestTicket
+    = ProjOpAcceptTicket
+    | ProjOpCloseTicket
+    | ProjOpReopenTicket
+    | ProjOpRequestTicket
     | ProjOpClaimTicket
     | ProjOpUnclaimTicket
     | ProjOpAssignTicket
diff --git a/templates/ticket/one.hamlet b/templates/ticket/one.hamlet
index 1be36b6..fa77105 100644
--- a/templates/ticket/one.hamlet
+++ b/templates/ticket/one.hamlet
@@ -88,6 +88,8 @@ $if ticketStatus ticket /= TSClosed
     $of TSNew
       Open, new.
 
+      <form method=POST action=@{TicketAcceptR shar proj num}>
+        <input type=submit value="Accept this ticket">
       <form method=POST action=@{TicketCloseR shar proj num}>
         <input type=submit value="Close this ticket">
     $of TSTodo