diff --git a/src/Jobs.hs b/src/Jobs.hs
index 5969c4f08..c61b92bd5 100644
--- a/src/Jobs.hs
+++ b/src/Jobs.hs
@@ -334,10 +334,19 @@ setSerializable act = setSerializable' (0 :: Integer)
         (\e -> $logWarnS "SQL" (tshow e) *> threadDelay (1e3 * 2 ^ logBackoff) *> setSerializable' (succ logBackoff))
         act'
 
+pruneLastExecs :: Crontab JobCtl -> DB ()
+pruneLastExecs crontab = runConduit $ selectSource [] [] .| C.mapM_ ensureCrontab
+  where
+    ensureCrontab (Entity leId CronLastExec{..})
+      | Just job <- Aeson.parseMaybe parseJSON cronLastExecJob
+      , HashMap.member (JobCtlQueue job) crontab
+      = return ()
+      | otherwise = delete leId
+        
 
 determineCrontab :: DB (Crontab JobCtl)
 -- ^ Extract all future jobs from the database (sheet deadlines, ...)
-determineCrontab = execWriterT $ do
+determineCrontab = (\ct -> ct <$ pruneLastExecs ct) <=< execWriterT $ do
   AppSettings{..} <- getsYesod appSettings
 
   case appJobFlushInterval of
@@ -377,7 +386,6 @@ determineCrontab = execWriterT $ do
           { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ . max sheetActiveFrom $ addUTCTime (-nominalDay) sheetActiveTo
           , cronRepeat = Nothing
           }
-      
   runConduit $ transPipe lift (selectSource [] []) .| C.mapM_ sheetJobs