diff --git a/geolog-lsp.cabal b/geolog-lsp.cabal
index 34051d5..c4968c0 100644
--- a/geolog-lsp.cabal
+++ b/geolog-lsp.cabal
@@ -26,7 +26,8 @@ library datalog-parser
         base,
         text,
         containers,
-        megaparsec
+        megaparsec,
+        pretty-simple,
     exposed-modules:
         Datalog.Parser,
         Datalog.Syntax