diff --git a/interfaces/cython/cantera/composite.py b/interfaces/cython/cantera/composite.py
index 3d30080465..9c299eb53e 100644
--- a/interfaces/cython/cantera/composite.py
+++ b/interfaces/cython/cantera/composite.py
@@ -905,7 +905,6 @@ def collect_data(self, cols=None, tabular=False, threshold=0, species=None):
         if tabular and len(self._shape) != 1:
             raise AttributeError("Tabular output of collect_data only works "
                                  "for 1D SolutionArray")
-        out = OrderedDict()
 
         # Create default columns (including complete state information)
         if cols is None:
@@ -929,7 +928,6 @@ def collect_data(self, cols=None, tabular=False, threshold=0, species=None):
 
         def split(c, d):
             """ Split attribute arrays into columns for tabular output """
-            single_species = False
             # Determine labels for the items in the current group of columns
             if c in self._n_species:
                 collabels = ['{}_{}'.format(c, s) for s in self.species_names]