diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -70,3 +70,5 @@
 		fixed Setup.lhs (as there is no configure.hs) 
  		  pointed out by dons
 
+0.2.2.8:
+		fixed definition of mutual information to be non-negative
diff --git a/hstatistics.cabal b/hstatistics.cabal
--- a/hstatistics.cabal
+++ b/hstatistics.cabal
@@ -1,5 +1,5 @@
 Name:               hstatistics
-Version:            0.2.2.7
+Version:            0.2.2.8
 License:            BSD3
 License-file:       LICENSE
 Copyright:          (c) A.V.H. McPhail 2010, 2011
diff --git a/lib/Numeric/Statistics/Information.hs b/lib/Numeric/Statistics/Information.hs
--- a/lib/Numeric/Statistics/Information.hs
+++ b/lib/Numeric/Statistics/Information.hs
@@ -54,6 +54,6 @@
 mutual_information p px py (x,y) = let ps = probability p $ zipVector x y
                                        xs = probability px x
                                        ys = probability py y
-                                   in negate $ dot ps (logE ps - logE (xs*ys)) 
+                                   in dot ps (logE ps - logE (xs*ys)) 
 
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