diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,13 +1,14 @@
+Changes in 0.10.5.1
+
+  * Bug fix for S.Distributions.Normal.standard introduced in 0.10.5.0 (Bug #56)
+
+
 Changes in 0.10.5.0
 
   * Enthropy type class for distributions is added.
 
   * Probability and probability density of distribution is given in
     log domain too.
-
-Changes in 0.10.4.1
-
-  * Bugfix for GHC < 7.6
 
 Changes in 0.10.4.0
 
diff --git a/Statistics/Distribution/Normal.hs b/Statistics/Distribution/Normal.hs
--- a/Statistics/Distribution/Normal.hs
+++ b/Statistics/Distribution/Normal.hs
@@ -76,7 +76,7 @@
 standard :: NormalDistribution
 standard = ND { mean       = 0.0
               , stdDev     = 1.0
-              , ndPdfDenom = m_sqrt_2_pi
+              , ndPdfDenom = log m_sqrt_2_pi
               , ndCdfDenom = m_sqrt_2
               }
 
diff --git a/statistics.cabal b/statistics.cabal
--- a/statistics.cabal
+++ b/statistics.cabal
@@ -1,5 +1,5 @@
 name:           statistics
-version:        0.10.5.0
+version:        0.10.5.1
 synopsis:       A library of statistical types, data, and functions
 description:
   This library provides a number of common functions and types useful