diff --git a/stochpy/modules/PyscesMiniModel.py b/stochpy/modules/PyscesMiniModel.py
index d0ada13..ad19639 100644
--- a/stochpy/modules/PyscesMiniModel.py
+++ b/stochpy/modules/PyscesMiniModel.py
@@ -1372,7 +1372,7 @@ def getSimData(self, *args, **kwargs):
         """
         output = self.time
 
-        if kwargs.has_key('lbls'):
+        if 'lbls' in kwargs:
             lbls = kwargs['lbls']
         else:
             lbls = False