diff --git a/src/py/crankshaft/crankshaft/clustering/moran.py b/src/py/crankshaft/crankshaft/clustering/moran.py
index a42a981..0e12e3f 100644
--- a/src/py/crankshaft/crankshaft/clustering/moran.py
+++ b/src/py/crankshaft/crankshaft/clustering/moran.py
@@ -88,7 +88,7 @@ class Moran:
         """
         params = OrderedDict([("id_col", id_col),
                               ("attr1", numerator),
-                              ("attr2", denominator)
+                              ("attr2", denominator),
                               ("geom_col", geom_col),
                               ("subquery", subquery),
                               ("num_ngbrs", num_ngbrs)])