diff --git a/GPy/core/parameterized.py b/GPy/core/parameterized.py
index 5d5184da..35d2795c 100644
--- a/GPy/core/parameterized.py
+++ b/GPy/core/parameterized.py
@@ -225,7 +225,7 @@ class Parameterized(object):
         x[matches] = transform.initialize(x[matches])
         self._set_params(x)
 
-    def constrain_fixed(self, regexp, value=None):
+    def constrain_fixed(self, regexp, value=None, warning=True):
         """
 
         :param regexp: which parameters need to be fixed.
@@ -242,13 +242,14 @@ class Parameterized(object):
 
         """
         matches = self.grep_param_names(regexp)
-        overlap = set(matches).intersection(set(self.all_constrained_indices()))
-        if overlap:
-            self.unconstrain(np.asarray(list(overlap)))
-            print 'Warning: re-constraining these parameters'
-            pn = self._get_param_names()
-            for i in overlap:
-                print pn[i]
+        if warning:
+            overlap = set(matches).intersection(set(self.all_constrained_indices()))
+            if overlap:
+                self.unconstrain(np.asarray(list(overlap)))
+                print 'Warning: re-constraining these parameters'
+                pn = self._get_param_names()
+                for i in overlap:
+                    print pn[i]
 
         self.fixed_indices.append(matches)
         if value != None:
diff --git a/GPy/models_modules/mrd.py b/GPy/models_modules/mrd.py
index cc962bd9..7a6bd386 100644
--- a/GPy/models_modules/mrd.py
+++ b/GPy/models_modules/mrd.py
@@ -327,9 +327,9 @@ class MRD(Model):
         if titles is None:
             titles = [r'${}$'.format(name) for name in self.names]
         ymax = reduce(max, [numpy.ceil(max(g.input_sensitivity())) for g in self.bgplvms])
-        def plotf(i, g, ax):
-            ax.set_ylim([0,ymax])
-            g.kern.plot_ARD(ax=ax, title=titles[i], *args, **kwargs)
+        def plotf(i, g, axis):
+            axis.set_ylim([0,ymax])
+            g.kern.plot_ARD(ax=axis, title=titles[i], *args, **kwargs)
         fig = self._handle_plotting(fignum, ax, plotf, sharex=sharex, sharey=sharey)
         return fig