diff --git a/src/ligo/ligo-parser/LexerMain.ml b/src/ligo/ligo-parser/LexerMain.ml
index 1280d3638..f61f5c407 100644
--- a/src/ligo/ligo-parser/LexerMain.ml
+++ b/src/ligo/ligo-parser/LexerMain.ml
@@ -24,7 +24,7 @@ let prefix =
     None | Some "-" -> "temp"
   | Some file ->  Filename.(file |> basename |> remove_extension)
 
-let suffix = ".pp.li"
+let suffix = ".pp.ligo"
 
 let pp_input =
   if Utils.String.Set.mem "cpp" EvalOpt.verbose
diff --git a/src/ligo/ligo-parser/ParserMain.ml b/src/ligo/ligo-parser/ParserMain.ml
index b75f712b0..9f5420e71 100644
--- a/src/ligo/ligo-parser/ParserMain.ml
+++ b/src/ligo/ligo-parser/ParserMain.ml
@@ -40,7 +40,7 @@ let prefix =
     None | Some "-" -> "temp"
   | Some file ->  Filename.(file |> basename |> remove_extension)
 
-let suffix = ".pp.li"
+let suffix = ".pp.ligo"
 
 let pp_input =
   if Utils.String.Set.mem "cpp" EvalOpt.verbose