diff --git a/glsvg/svg_path_builder.py b/glsvg/svg_path_builder.py
index b6d10eb..cf792d6 100644
--- a/glsvg/svg_path_builder.py
+++ b/glsvg/svg_path_builder.py
@@ -108,8 +108,8 @@ def next_point():
             self.end_path()
         elif e.tag.endswith('circle'):
             self.shape = path.shape = 'circle'
-            cx = float(e.get('cx'))
-            cy = float(e.get('cy'))
+            cx = float(e.get('cx', '0'))
+            cy = float(e.get('cy', '0'))
             r = float(e.get('r'))
             path.cx, path.cy, path.r = cx, cy, r
             for i in xrange(config.circle_points):
@@ -119,8 +119,8 @@ def next_point():
             self.end_path()
         elif e.tag.endswith('ellipse'):
             self.shape = path.shape = 'ellipse'
-            cx = float(e.get('cx'))
-            cy = float(e.get('cy'))
+            cx = float(e.get('cx', '0'))
+            cy = float(e.get('cy', '0'))
             rx = float(e.get('rx'))
             ry = float(e.get('ry'))
             path.cx, path.cy, path.rx, path.ry = cx, cy, rx, ry
@@ -440,4 +440,3 @@ def _warn(self, message):
         print "Warning: SVG Parser - %s" % (message,)
 
 
-