diff --git a/spotpy/parameter.py b/spotpy/parameter.py
index c03e9608..c786172c 100644
--- a/spotpy/parameter.py
+++ b/spotpy/parameter.py
@@ -431,7 +431,7 @@ def __init__(self, *args, **kwargs):
                 default is median of rndfunc(*rndargs, size=1000)
         :optguess: (optional) number for start point of parameter
                 default is quantile(0.5) - quantile(0.4) of 
-                rndfunc(*rndargs, size=1000) 
+                rndfunc(*rndargs, size=1000)
         """
         super(Exponential, self).__init__(rnd.exponential, 'Exponential', *args, **kwargs)
 
@@ -474,7 +474,7 @@ def __init__(self, *args, **kwargs):
                 default is median of rndfunc(*rndargs, size=1000)
         :optguess: (optional) number for start point of parameter
                 default is quantile(0.5) - quantile(0.4) of 
-                rndfunc(*rndargs, size=1000) 
+                rndfunc(*rndargs, size=1000)
         """
         super(Wald, self).__init__(rnd.wald, 'Wald', *args, **kwargs)
 
diff --git a/tests/test_analyser.py b/tests/test_analyser.py
index ba35f13f..7c8444d8 100644
--- a/tests/test_analyser.py
+++ b/tests/test_analyser.py
@@ -362,7 +362,7 @@ def test_plot_autocorellation(self):
 
     def test_plot_gelman_rubin(self):
         if sys.version_info >= (3, 6):
-            spotpy.analyser.plot_gelman_rubin(self.r_hat, fig_name =self.fig_name)
+            spotpy.analyser.plot_gelman_rubin(self.hymod_results, self.r_hat, fig_name =self.fig_name)
             self.assertGreaterEqual(abs(os.path.getsize(self.fig_name)), 100)