diff --git a/cabal.project b/cabal.project
index 9948f1afb..1ba410e0a 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,4 +1,4 @@
 packages: gibbon-compiler
 
 program-options
-    ghc-options: -Werror=tabs
+    ghc-options: -Werror