diff --git a/GF.cabal b/GF.cabal
index 3fbdd8272..2b3fd725d 100644
--- a/GF.cabal
+++ b/GF.cabal
@@ -49,7 +49,7 @@ library
     PGF.Morphology
     PGF.VisualizeTree
     PGF.Printer
-	PGF.Probabilistic
+    PGF.Probabilistic
     GF.Data.TrieMap
     GF.Data.Utilities
     GF.Data.SortedList