1 files changed, 1 insertions, 0 deletions
diff --git a/oso2pdf.cabal b/oso2pdf.cabal
index be1c97c..395e122 100644
--- a/oso2pdf.cabal
+++ b/oso2pdf.cabal
@@ -28,6 +28,7 @@ executable oso2pdf
                      , process
                      , temporary
                      , filepath
+                     , mtl
   default-language:    Haskell2010
 
 source-repository head