diff --git a/Source/Layer.hpp b/Source/Layer.hpp
index 1f2222e..c0c510e 100644
--- a/Source/Layer.hpp
+++ b/Source/Layer.hpp
@@ -151,8 +151,8 @@ protected:
 
 		for (i=0; i < m_numUnits; i++)
 		{
-			double x2 = (1-(double)mu[i]);
-			m_probs[i] = k*exp(-0.5*x2*x2/var);
+			double x2 = ((double)mu[i]);
+			m_probs[i] = 1-exp(-0.5*x2*x2/var);
 		}
 	}
 };