diff --git a/GPy/likelihoods/likelihood.py b/GPy/likelihoods/likelihood.py
index 31f5dffd..73118569 100644
--- a/GPy/likelihoods/likelihood.py
+++ b/GPy/likelihoods/likelihood.py
@@ -267,7 +267,7 @@ class Likelihood(Parameterized):
 
         if self.size:
             dF_dtheta = self.dlogpdf_dtheta(X, Y[:,None]) # Ntheta x (orig size) x N_{quad_points}
-            dF_dtheta = np.dot(dF_dtheta, gh_w)
+            dF_dtheta = np.dot(dF_dtheta, gh_w)/np.sqrt(np.pi)
             dF_dtheta = dF_dtheta.reshape(self.size, shape[0], shape[1])
         else:
             dF_dtheta = None # Not yet implemented