diff --git a/JSAT/src/jsat/distributions/Normal.java b/JSAT/src/jsat/distributions/Normal.java
index <HASH>..<HASH> 100644
--- a/JSAT/src/jsat/distributions/Normal.java
+++ b/JSAT/src/jsat/distributions/Normal.java
@@ -149,7 +149,7 @@ public class Normal extends Distribution
      */
     public static double logPdf(double x, double mu, double sigma)
     {
-        return -0.5*log(2*PI) + log(sigma) + -pow(x-mu,2)/(2*sigma*sigma);
+        return -0.5*log(2*PI) - log(sigma) + -pow(x-mu,2)/(2*sigma*sigma);
     }
 
     @Override
Correction of mathematical error

In <I>f<I>b<I>dade<I>a7ad8a<I>d<I>b<I>f7 a sign error was made when expanding the parenthesis.