2 files changed, 10 insertions, 5 deletions

diff --git a/spec/src/Thermoprint/API.hs b/spec/src/Thermoprint/API.hs
index 00115f3..e3d4b61 100644
--- a/spec/src/Thermoprint/API.hs
+++ b/spec/src/Thermoprint/API.hs
@@ -30,12 +30,13 @@ import qualified Data.IntMap.Strict as IntMap (foldMapWithKey, singleton)
 
 import Data.Text (Text)
 
+import Data.Typeable (Typeable)
 import GHC.Generics (Generic)
+import Control.DeepSeq (NFData)
 
 import Data.Proxy (Proxy(..))
 
 import Control.Exception (Exception)
-import Data.Typeable (Typeable)
 
 instance (Integral k, Ord k, ToJSON v) => ToJSON (Map k v) where
   toJSON = toJSON . Map.foldMapWithKey (IntMap.singleton . castId)
@@ -55,7 +56,7 @@ data JobStatus = Queued PrinterId
                deriving (Generic, Show, Read, FromJSON, ToJSON)
 
 data PrintingError = UnknownError
-                   deriving (Typeable, Generic, Show, Read, FromJSON, ToJSON, Exception)
+                   deriving (Typeable, Generic, NFData, Show, Read, FromJSON, ToJSON, Exception)
 
 type DraftTitle = Text
 
diff --git a/spec/src/Thermoprint/Identifiers.hs b/spec/src/Thermoprint/Identifiers.hs
index ee35e24..0d6f56a 100644
--- a/spec/src/Thermoprint/Identifiers.hs
+++ b/spec/src/Thermoprint/Identifiers.hs
@@ -8,17 +8,21 @@ module Thermoprint.Identifiers
        , castId
        ) where
 
+import Data.Typeable (Typeable)
+import GHC.Generics (Generic)
+import Control.DeepSeq (NFData)
+
 import Servant.API (ToText, FromText)
 import Data.Aeson (FromJSON, ToJSON)
 
 newtype PrinterId = PrinterId Integer
-                  deriving (Show, Read, Eq, Ord, Num, Real, Integral, Enum, FromText, ToText, FromJSON, ToJSON)
+                  deriving (Show, Read, Eq, Ord, Num, Real, Integral, Enum, FromText, ToText, FromJSON, ToJSON, Typeable, Generic, NFData)
 
 newtype JobId = JobId Integer
-              deriving (Show, Read, Eq, Ord, Num, Real, Integral, Enum, FromText, ToText, FromJSON, ToJSON)
+              deriving (Show, Read, Eq, Ord, Num, Real, Integral, Enum, FromText, ToText, FromJSON, ToJSON, Typeable, Generic, NFData)
 
 newtype DraftId = DraftId Integer
-              deriving (Show, Read, Eq, Ord, Num, Real, Integral, Enum, FromText, ToText, FromJSON, ToJSON)
+              deriving (Show, Read, Eq, Ord, Num, Real, Integral, Enum, FromText, ToText, FromJSON, ToJSON, Typeable, Generic, NFData)
 
 castId :: (Integral a, Enum b) => a -> b
 castId = toEnum . fromInteger . toInteger