diff --git a/src/Nixfmt/Parser.hs b/src/Nixfmt/Parser.hs
index a4c0c6f8..361efab6 100644
--- a/src/Nixfmt/Parser.hs
+++ b/src/Nixfmt/Parser.hs
@@ -14,7 +14,7 @@ import Data.Char (isAlpha)
 import Data.Foldable (toList)
 import Data.Functor (($>))
 import Data.Maybe (fromMaybe, mapMaybe, maybeToList)
-import Data.Text (Text)
+import Data.Text (Text, pack)
 import qualified Data.Text as Text
 import Data.Void (Void)
 import Nixfmt.Lexer (lexeme, takeTrivia, whole)
@@ -71,8 +71,7 @@ import Text.Megaparsec (
   try,
   (<|>),
  )
-import Text.Megaparsec.Char (char)
-import qualified Text.Megaparsec.Char.Lexer as L (decimal)
+import Text.Megaparsec.Char (char, digitChar)
 import Prelude hiding (String)
 
 -- HELPER FUNCTIONS
@@ -110,7 +109,7 @@ reserved t =
 -- VALUES
 
 integer :: Parser (Ann Token)
-integer = ann Integer L.decimal
+integer = ann Integer (pack <$> some digitChar)
 
 float :: Parser (Ann Token)
 float = ann Float floatParse
diff --git a/src/Nixfmt/Types.hs b/src/Nixfmt/Types.hs
index 43d9073e..244ef71d 100644
--- a/src/Nixfmt/Types.hs
+++ b/src/Nixfmt/Types.hs
@@ -48,10 +48,9 @@ import Control.Monad.State.Strict (StateT)
 import Data.Bifunctor (first)
 import Data.Foldable (toList)
 import Data.Function (on)
-import Data.Int (Int64)
 import Data.List.NonEmpty as NonEmpty
 import Data.Maybe (maybeToList)
-import Data.Text (Text, pack)
+import Data.Text (Text)
 import Data.Void (Void)
 import Text.Megaparsec (Pos)
 import qualified Text.Megaparsec as MP (ParseErrorBundle, Parsec, pos1)
@@ -488,7 +487,7 @@ instance (LanguageElement a) => LanguageElement (NonEmpty a) where
   mapAllTokens f = NonEmpty.map (mapAllTokens f)
 
 data Token
-  = Integer Int64
+  = Integer Text
   | Float Text
   | Identifier Text
   | EnvPath Text
@@ -588,7 +587,7 @@ operators =
 
 tokenText :: Token -> Text
 tokenText (Identifier i) = i
-tokenText (Integer i) = pack (show i)
+tokenText (Integer i) = i
 tokenText (Float f) = f
 tokenText (EnvPath p) = "<" <> p <> ">"
 tokenText KAssert = "assert"
diff --git a/test/correct/numbers.nix b/test/correct/numbers.nix
index 8df9eb55..dd6ad802 100644
--- a/test/correct/numbers.nix
+++ b/test/correct/numbers.nix
@@ -3,9 +3,13 @@
   (-1)
   0
   1
-  # 01
-  # 0000000000000000000000000000000000000000000001
+  # https://github.com/NixOS/nixfmt/issues/292
+  01
+  0000000000000000000000000000000000000000000001
   9223372036854775807
+  55555555555555555555555555555
+  (-9223372036854775808)
+  9223372036854775808
 
   .1
   0.1