diff --git a/bk-tree.cabal b/bk-tree.cabal
--- a/bk-tree.cabal
+++ b/bk-tree.cabal
@@ -1,6 +1,6 @@
 Cabal-Version:      >= 1.8
 Name:               bk-tree
-Version:            0.1
+Version:            0.1.1
 Author:             Francesco Mazzoli (f@mazzo.li)
 Maintainer:         Francesco Mazzoli (f@mazzo.li)
 Build-Type:         Simple
@@ -22,6 +22,6 @@
     Build-Depends:    base >= 3 && < 5,
                       containers
 
-    GHC-Options:      -Werror -O2
+    GHC-Options:      -Wall -O2
 
     Exposed-Modules:  Data.BKTree