diff --git a/swmmio/utils/spatial.py b/swmmio/utils/spatial.py
index 8dd7812..e3570c6 100644
--- a/swmmio/utils/spatial.py
+++ b/swmmio/utils/spatial.py
@@ -216,6 +216,8 @@ def write_shapefile(df, filename, geomtype='line', prj=None):
             w.line([row.coords])
         if geomtype == 'point':
             w.point(*row.coords[0])
+        if geomtype== 'polygon': 
+            w.poly([row.coords])
 
     w.close()