diff --git a/haskell/p2prc.cabal b/haskell/p2prc.cabal
index 6e5c319..a39a2fc 100644
--- a/haskell/p2prc.cabal
+++ b/haskell/p2prc.cabal
@@ -78,7 +78,7 @@ executable p2prc
                       , p2prc
 
     -- Directories containing source files.
-    hs-source-dirs:   app
+    hs-source-dirs:   src
 
     -- Base language which the package is written in.
     default-language: GHC2021
diff --git a/haskell/app/Main.hs b/haskell/src/Main.hs
similarity index 100%
rename from haskell/app/Main.hs
rename to haskell/src/Main.hs