diff --git a/geojson/geometry.py b/geojson/geometry.py
index 30facc3..fd312c4 100644
--- a/geojson/geometry.py
+++ b/geojson/geometry.py
@@ -1,6 +1,7 @@
 from decimal import Decimal
 
 from geojson.base import GeoJSON
+import sys
 
 
 class Geometry(GeoJSON):
@@ -8,6 +9,12 @@ class Geometry(GeoJSON):
     Represents an abstract base class for a WGS84 geometry.
     """
 
+    if (sys.version_info[0] == 3):
+        # Python 3.x has no long type
+        JSON_compliant_types = (float, int, Decimal)
+    else:
+        JSON_compliant_types = (float, int, Decimal, long)  # noqa
+
     def __init__(self, coordinates=None, crs=None, **extra):
         """
         Initialises a Geometry object.
@@ -29,7 +36,7 @@ def clean_coordinates(cls, coords):
         for coord in coords:
             if isinstance(coord, (list, tuple)):
                 cls.clean_coordinates(coord)
-            elif not isinstance(coord, (float, int, Decimal)):
+            elif not isinstance(coord, cls.JSON_compliant_types):
                 raise ValueError("%r is not JSON compliant number" % coord)