diff --git a/src/Nixfmt/Parser/Float.hs b/src/Nixfmt/Parser/Float.hs
index df50efe1..c5360b55 100644
--- a/src/Nixfmt/Parser/Float.hs
+++ b/src/Nixfmt/Parser/Float.hs
@@ -27,6 +27,7 @@ data SP = SP !Integer {-# UNPACK #-} !Int
 floatParse :: (MonadParsec e s m, Token s ~ Char, RealFloat a) => m a
 floatParse = do
   notFollowedBy $ (char '0') >> digitChar
+  notFollowedBy $ (char' 'e')
   c' <- (decimal <?> "decimal") <|> return 0
   toRealFloat
     <$> (( do