diff --git a/Database/Persist/Postgresql.hs b/Database/Persist/Postgresql.hs
--- a/Database/Persist/Postgresql.hs
+++ b/Database/Persist/Postgresql.hs
@@ -144,11 +144,15 @@
   let sql = T.concat
                 [ "INSERT INTO "
                 , escape $ entityDB ent
-                , "("
-                , T.intercalate "," $ map (escape . fieldDB) $ entityFields ent
-                , ") VALUES("
-                , T.intercalate "," (map (const "?") $ entityFields ent)
-                , ")"
+                , if null (entityFields ent)
+                    then " DEFAULT VALUES"
+                    else T.concat
+                        [ "("
+                        , T.intercalate "," $ map (escape . fieldDB) $ entityFields ent
+                        , ") VALUES("
+                        , T.intercalate "," (map (const "?") $ entityFields ent)
+                        , ")"
+                        ]
                 ]
   in case entityPrimary ent of
        Just pdef -> ISRManyKeys sql vals
diff --git a/persistent-postgresql.cabal b/persistent-postgresql.cabal
--- a/persistent-postgresql.cabal
+++ b/persistent-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-postgresql
-version:         1.3.0.4
+version:         1.3.0.5
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa, Michael Snoyman <michael@snoyman.com>