diff --git a/src/Database/Persist/Types/Instances.hs b/src/Database/Persist/Types/Instances.hs
index e32ed5951..176c551f9 100644
--- a/src/Database/Persist/Types/Instances.hs
+++ b/src/Database/Persist/Types/Instances.hs
@@ -32,7 +32,6 @@ deriving instance Generic PersistValue
 
 instance Hashable PersistValue
 instance Binary PersistValue
-instance NFData PersistValue
 
 instance (NFData record, NFData (Key record)) => NFData (Entity record) where
   rnf Entity{..} = rnf entityKey `seq` rnf entityVal