diff --git a/lib/Echidna/Solidity.hs b/lib/Echidna/Solidity.hs
index 0140816f..1e002302 100644
--- a/lib/Echidna/Solidity.hs
+++ b/lib/Echidna/Solidity.hs
@@ -22,7 +22,7 @@ import System.IO.Temp             (writeSystemTempFile)
 import qualified Data.Map as Map (lookup)
 
 import Echidna.ABI    (SolSignature)
-import Echidna.Config (Config(..), sender, contractAddr, gasLimit, prefix, solcArgs, outputJson)
+import Echidna.Config (Config(..), sender, contractAddr, gasLimit, prefix, solcArgs)
 
 
 import EVM
@@ -70,14 +70,11 @@ readContracts filePath = do
 -- | reads either the first contract found or the contract named `selectedContractName` within the solidity file at `filepath`
 readContract :: (MonadIO m, MonadThrow m, MonadReader Config m) => FilePath -> Maybe Text -> m SolcContract
 readContract filePath selectedContractName = do
-    config <- ask
     cs <- readContracts filePath
     c <- chooseContract cs selectedContractName
-    if config ^. outputJson then pure ()
-      else do
-      warn (isNothing selectedContractName && 1 < length cs)
-        "Multiple contracts found in file, only analyzing the first"
-      liftIO $ print $ "Analyzing contract: " <> c ^. contractName
+    warn (isNothing selectedContractName && 1 < length cs)
+      "Multiple contracts found in file, only analyzing the first"
+    liftIO $ print $ "Analyzing contract: " <> c ^. contractName
     return c
   where chooseContract :: (MonadThrow m) => [SolcContract] -> Maybe Text -> m SolcContract
         chooseContract [] _ = throwM NoContracts
diff --git a/src/Main.hs b/src/Main.hs
index b5e6f889..93bde2c3 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -15,7 +15,6 @@ import Data.Semigroup          ((<>))
 import Echidna.Config
 import Echidna.Exec
 import Echidna.Solidity
---import Echidna.Internal.ZooRunner as Z
 
 import Hedgehog hiding (checkParallel)
 import Hedgehog.Internal.Property (GroupName(..), PropertyName(..))
@@ -56,7 +55,9 @@ main = do
   -- Read cmd line options and load config
   (Options file contract usecov configFile) <- execParser opts
   config <- maybe (pure defaultConfig) parseConfig configFile
+
   let f = checkTest (config ^. returnType)
+      checkGroup = if config ^. outputJson then checkParallelJson else checkParallel
 
   flip runReaderT config $ do
     -- Load solidity contract and get VM
@@ -65,7 +66,7 @@ main = do
       -- Run without coverage
       then do
       let prop t = ePropertySeq (`f` t) a v >>= \x -> return (PropertyName $ show t, x)
-      _ <- checkParallel . Group (GroupName file) =<< mapM prop ts
+      _ <- checkGroup . Group (GroupName file) =<< mapM prop ts
       return ()
 
       -- Run with coverage
@@ -81,7 +82,7 @@ main = do
           _ <- swapMVar y []
           return (lastGen,x,y)
 
-        checkParallel . Group (GroupName file) =<< mapM prop xs
+        checkGroup . Group (GroupName file) =<< mapM prop xs
         
       ls <- liftIO $ mapM (readMVar . snd) tests
       let ci = foldl' (\acc xs -> unions (acc : map snd xs)) mempty ls