diff --git a/src/Vervis/Foundation.hs b/src/Vervis/Foundation.hs
index 5e1cd5c..291f812 100644
--- a/src/Vervis/Foundation.hs
+++ b/src/Vervis/Foundation.hs
@@ -951,6 +951,7 @@ instance YesodBreadcrumbs App where
 
         TicketNewR d         -> ("New Ticket", Just $ DeckR d)
         TicketCloseR _ _     -> ("", Nothing)
+        TicketOpenR _ _     -> ("", Nothing)
         TicketFollowR _ _    -> ("", Nothing)
         TicketUnfollowR _ _  -> ("", Nothing)
         TicketReplyR d t     -> ("Reply", Just $ TicketR d t)
diff --git a/src/Vervis/Handler/Ticket.hs b/src/Vervis/Handler/Ticket.hs
index 07a3b32..5d4c513 100644
--- a/src/Vervis/Handler/Ticket.hs
+++ b/src/Vervis/Handler/Ticket.hs
@@ -27,6 +27,7 @@ module Vervis.Handler.Ticket
     , getTicketNewR
     , postTicketNewR
     , postTicketCloseR
+    , postTicketOpenR
 
     , postTicketFollowR
     , postTicketUnfollowR
@@ -520,6 +521,36 @@ postTicketCloseR deckHash taskHash = do
             setMessage "Resolve activity sent"
             redirect $ TicketR deckHash taskHash
 
+postTicketOpenR :: KeyHashid Deck -> KeyHashid TicketDeck -> Handler ()
+postTicketOpenR deckHash taskHash = do
+    deckID <- decodeKeyHashid404 deckHash
+    taskID <- decodeKeyHashid404 taskHash
+
+    personEntity@(Entity personID person) <- requireAuth
+    personHash <- encodeKeyHashid personID
+    encodeRouteHome <- getEncodeRouteHome
+    let uTicket = encodeRouteHome $ TicketR deckHash taskHash
+    result <- runExceptT $ do
+        (maybeSummary, audience, undo) <- C.unresolve personHash uTicket
+        grantID <- do
+            maybeItem <- lift $ runDB $ getGrant CollabTopicDeckCollab CollabTopicDeckDeck deckID personID
+            fromMaybeE maybeItem "You need to be a collaborator in the Deck to reopen tickets"
+        grantHash <- encodeKeyHashid grantID
+        let uCap = encodeRouteHome $ DeckOutboxItemR deckHash grantHash
+        (localRecips, remoteRecips, fwdHosts, action) <-
+            C.makeServerInput (Just uCap) maybeSummary audience $ AP.UndoActivity undo
+        let cap =
+                Left (LocalActorDeck deckID, LocalActorDeck deckHash, grantID)
+        handleViaActor personID (Just cap) localRecips remoteRecips fwdHosts action
+
+    case result of
+        Left e -> do
+            setMessage $ toHtml e
+            redirect $ TicketR deckHash taskHash
+        Right resolveID -> do
+            setMessage "Undo activity sent"
+            redirect $ TicketR deckHash taskHash
+
 postTicketFollowR :: KeyHashid Deck -> KeyHashid TicketDeck -> Handler ()
 postTicketFollowR _ = error "Temporarily disabled"
 
diff --git a/templates/ticket/one.hamlet b/templates/ticket/one.hamlet
index aeeffcc..002a477 100644
--- a/templates/ticket/one.hamlet
+++ b/templates/ticket/one.hamlet
@@ -69,7 +69,7 @@ $#       .
   Status: #
   $maybe (closed, closer) <- resolved
     Closed on #{showDate closed} by ^{personLinkFedW closer}
-$#  ^{buttonW POST "Reopen this ticket" (ProjectTicketOpenR deckHash ticketHash)}
+    ^{buttonW POST "Reopen this ticket" (TicketOpenR deckHash ticketHash)}
   $nothing
     Open
     ^{buttonW POST "Close this ticket" (TicketCloseR deckHash ticketHash)}
diff --git a/th/routes b/th/routes
index 861e61a..71d01bc 100644
--- a/th/routes
+++ b/th/routes
@@ -240,7 +240,7 @@
 -- /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/edit       TicketEditR        GET POST
 -- /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/delete     TicketDeleteR      POST
 /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/close      TicketCloseR       POST
--- /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/open       TicketOpenR        POST
+/decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/open       TicketOpenR        POST
 -- /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/claim      TicketClaimR       POST
 -- /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/unclaim    TicketUnclaimR     POST
 -- /decks/#DeckKeyHashid/tickets/#TicketDeckKeyHashid/assign     TicketAssignR      GET POST