diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 Changelog for tmp-postgres
 
+1.22.0.0
+  #174 Better postgresql.conf type.
+
 1.21.1.1
   #172 Fix verboseLogging not working
 
diff --git a/src/Database/Postgres/Temp.hs b/src/Database/Postgres/Temp.hs
--- a/src/Database/Postgres/Temp.hs
+++ b/src/Database/Postgres/Temp.hs
@@ -68,6 +68,7 @@
   , toConnectionOptions
   , toDataDirectory
   , toTemporaryDirectory
+  , toPostgresqlConf
   -- *** 'DB' modifiers
   , makeDataDirPermanent
   , reloadConfig
diff --git a/src/Database/Postgres/Temp/Internal.hs b/src/Database/Postgres/Temp/Internal.hs
--- a/src/Database/Postgres/Temp/Internal.hs
+++ b/src/Database/Postgres/Temp/Internal.hs
@@ -93,6 +93,14 @@
 --   @since 1.12.0.0
 toTemporaryDirectory :: DB -> FilePath
 toTemporaryDirectory = resourcesTemporaryDir . dbResources
+
+{-|
+Get the final @postgresql.conf@
+
+@since 1.22.0.0
+-}
+toPostgresqlConf :: DB -> String
+toPostgresqlConf = completePlanConfig . resourcesPlan . dbResources
 -------------------------------------------------------------------------------
 -- Life Cycle Management
 -------------------------------------------------------------------------------
@@ -112,16 +120,16 @@
 
 @since 1.21.0.0
 -}
-fastPostgresConfig :: [String]
+fastPostgresConfig :: [(String, String)]
 fastPostgresConfig =
-  [ "shared_buffers = 12MB"
-  , "fsync = off"
-  , "synchronous_commit = off"
-  , "full_page_writes = off"
-  , "log_min_messages = PANIC"
-  , "log_min_error_statement = PANIC"
-  , "log_statement = none"
-  , "client_min_messages = ERROR"
+  [ ("shared_buffers", "12MB")
+  , ("fsync", "off")
+  , ("synchronous_commit", "off")
+  , ("full_page_writes", "off")
+  , ("log_min_messages", "PANIC")
+  , ("log_min_error_statement", "PANIC")
+  , ("log_statement", "none")
+  , ("client_min_messages", "ERROR")
   ]
 
 {-|
@@ -196,7 +204,7 @@
 defaultConfig :: Config
 defaultConfig = mempty
   { plan = mempty
-    { postgresConfigFile = verbosePostgresConfig
+    { postgresConfigFile = fastPostgresConfig
     , initDbConfig = pure mempty
       { commandLine = mempty
         { keyBased = Map.singleton "--no-sync" Nothing
@@ -217,7 +225,7 @@
 defaultConfig_9_3_10 :: Config
 defaultConfig_9_3_10 = mempty
   { plan = mempty
-    { postgresConfigFile = verbosePostgresConfig
+    { postgresConfigFile = fastPostgresConfig
     , initDbConfig = pure mempty
       { commandLine = mempty
         { keyBased = Map.singleton "--nosync" Nothing
@@ -246,7 +254,7 @@
 
 @since 1.21.0.0
 -}
-defaultPostgresConf :: [String] -> Config
+defaultPostgresConf :: [(String, String)] -> Config
 defaultPostgresConf extra = defaultConfig <> mempty
   { plan = mempty
     { postgresConfigFile = extra
@@ -256,16 +264,16 @@
 -- | Default postgres options
 --
 --   @since 1.21.0.0
-verbosePostgresConfig :: [String]
+verbosePostgresConfig :: [(String, String)]
 verbosePostgresConfig =
-  [ "shared_buffers = 12MB"
-  , "fsync = off"
-  , "synchronous_commit = off"
-  , "full_page_writes = off"
-  , "log_min_duration_statement = 0"
-  , "log_connections = on"
-  , "log_disconnections = on"
-  , "client_min_messages = WARNING"
+  [ ("shared_buffers", "12MB")
+  , ("fsync", "off")
+  , ("synchronous_commit", "off")
+  , ("full_page_writes", "off")
+  , ("log_min_duration_statement", "0")
+  , ("log_connections", "on")
+  , ("log_disconnections", "on")
+  , ("client_min_messages", "WARNING")
   ]
 
 {-|
diff --git a/src/Database/Postgres/Temp/Internal/Config.hs b/src/Database/Postgres/Temp/Internal/Config.hs
--- a/src/Database/Postgres/Temp/Internal/Config.hs
+++ b/src/Database/Postgres/Temp/Internal/Config.hs
@@ -439,7 +439,7 @@
   , copyConfig :: Last (Maybe CopyDirectoryCommand)
   , createDbConfig :: Accum ProcessConfig
   , postgresPlan :: PostgresPlan
-  , postgresConfigFile :: [String]
+  , postgresConfigFile :: [(String, String)]
   , dataDirectoryString :: Last String
   , connectionTimeout :: Last Int
   -- ^ Max time to spend attempting to connection to @postgres@.
@@ -468,12 +468,16 @@
     <> hardline
     <> text "postgresConfigFile:"
     <> softline
-    <> indent 2 (vsep $ map text postgresConfigFile)
+    <> indent 2 (vsep $ map (\(x, y) -> text x <> "=" <> text y) postgresConfigFile)
     <> hardline
     <> text "dataDirectoryString:" <+> pretty (getLast dataDirectoryString)
     <> hardline
     <> text "connectionTimeout:" <+> pretty (getLast connectionTimeout)
 
+flattenConfig :: [(String, String)] -> String
+flattenConfig = unlines . map (\(x, y) -> x <> "=" <> y) .
+  Map.toList . Map.fromList
+
 -- | Turn a 'Plan' into a 'CompletePlan'. Fails if any values are missing.
 completePlan :: [(String, String)] -> Plan -> Either [String] CompletePlan
 completePlan envs Plan {..} = do
@@ -495,7 +499,7 @@
         <*> getOption "dataDirectoryString" dataDirectoryString
         <*> getOption "connectionTimeout" connectionTimeout
 
-  let completePlanConfig = unlines postgresConfigFile
+  let completePlanConfig = flattenConfig postgresConfigFile
       completePlanCopy = completeCopyDirectory completePlanDataDirectory <$>
         join (getLast copyConfig)
 
@@ -557,10 +561,10 @@
     <> hardline
     <> text "initDbCache:" <+> pretty (getLast initDbCache)
 
-socketDirectoryToConfig :: FilePath -> [String]
+socketDirectoryToConfig :: FilePath -> [(String, String)]
 socketDirectoryToConfig dir =
-    [ "listen_addresses = '127.0.0.1,::1'"
-    , "unix_socket_directories = '" <> dir <> "'"
+    [ ("listen_addresses", "'127.0.0.1,::1'")
+    , ("unix_socket_directories", "'" <> dir <> "'")
     ]
 
 -------------------------------------------------------------------------------
@@ -1038,7 +1042,7 @@
 -- | Lens for 'postgresConfigFile'.
 --
 --   @since 1.12.0.0
-postgresConfigFileL :: Lens' Plan [String]
+postgresConfigFileL :: Lens' Plan [(String, String)]
 postgresConfigFileL f plan@Plan{..}
   = fmap (\x -> plan { postgresConfigFile = x })
       (f postgresConfigFile)
diff --git a/test/Main.hs b/test/Main.hs
--- a/test/Main.hs
+++ b/test/Main.hs
@@ -177,7 +177,7 @@
   let
     cConfig = mempty
       { plan = mempty
-        { postgresConfigFile = ["log_min_duration_statement='100ms'"]
+        { postgresConfigFile = [("log_min_duration_statement","'100ms'")]
         }
       }
 
@@ -384,6 +384,9 @@
     withDbCache $ \cacheInfo ->
       either throwIO pure =<< withConfig (cacheResourcesToConfig cacheInfo) assertConnection
 
+  it "postgresql.conf append last wins" $
+    withConfig' (defaultPostgresConf [("fsync", "on")]) $ \db -> do
+      toPostgresqlConf db `shouldContain` "fsync=on"
 --
 -- Error Plans. Can't be combined. Just list them out inline since they can't be combined
 --
@@ -644,9 +647,9 @@
       Set.isSubsetOf wordsToSearchFor
 
   let justBackupResources = defaultPostgresConf
-        [ "wal_level=replica"
-        , "archive_mode=on"
-        , "max_wal_senders=2"
+        [ ("wal_level", "replica")
+        , ("archive_mode","on")
+        , ("max_wal_senders","2")
         ]
       backupResources = justBackupResources
 
diff --git a/tmp-postgres.cabal b/tmp-postgres.cabal
--- a/tmp-postgres.cabal
+++ b/tmp-postgres.cabal
@@ -1,5 +1,5 @@
 name:                tmp-postgres
-version:             1.21.1.1
+version:             1.22.0.0
 synopsis: Start and stop a temporary postgres
 description: Start and stop a temporary postgres. See README.md
 homepage:            https://github.com/jfischoff/tmp-postgres#readme