diff --git a/GF.cabal b/GF.cabal
index a77152134..a542349d0 100644
--- a/GF.cabal
+++ b/GF.cabal
@@ -1,7 +1,7 @@
 name: gf
 version: 3.1
 cabal-version: >= 1.2
-build-type: Simple
+build-type: Custom
 license: GPL
 license-file: LICENSE
 synopsis: Grammatical Framework