diff --git a/esqueleto.cabal b/esqueleto.cabal
index 628eb3f..a477bfb 100644
--- a/esqueleto.cabal
+++ b/esqueleto.cabal
@@ -74,6 +74,7 @@ library
     , monad-logger
     , conduit              >= 1.1
     , resourcet            >= 1.1
+    , time                 >= 1.6.0.1
     , blaze-html
   hs-source-dirs: src/
   if impl(ghc >= 8.0)
diff --git a/src/Database/Esqueleto/Internal/Language.hs b/src/Database/Esqueleto/Internal/Language.hs
index 261246c..6536f3e 100644
--- a/src/Database/Esqueleto/Internal/Language.hs
+++ b/src/Database/Esqueleto/Internal/Language.hs
@@ -53,6 +53,7 @@ import Text.Blaze.Html (Html)
 import qualified Data.ByteString as B
 import qualified Data.Text as T
 import qualified Data.Text.Lazy as TL
+import Data.Time.Clock (UTCTime)
 
 
 -- | Finally tagless representation of @esqueleto@'s EDSL.
@@ -352,7 +353,7 @@ class (Functor query, Applicative query, Monad query) =>
 
 
   random_  :: (PersistField a, Num a) => expr (Value a)
-  now_     :: (PersistField a)        => expr (Value a)
+  now_     :: (PersistField a, a ~ UTCTime) => expr (Value a)
   round_   :: (PersistField a, Num a, PersistField b, Num b) => expr (Value a) -> expr (Value b)
   ceiling_ :: (PersistField a, Num a, PersistField b, Num b) => expr (Value a) -> expr (Value b)
   floor_   :: (PersistField a, Num a, PersistField b, Num b) => expr (Value a) -> expr (Value b)