diff --git a/bindings/python/mapnik/ogcserver/cgiserver.py b/bindings/python/mapnik/ogcserver/cgiserver.py
index 30c74f007..465b6c6cf 100644
--- a/bindings/python/mapnik/ogcserver/cgiserver.py
+++ b/bindings/python/mapnik/ogcserver/cgiserver.py
@@ -84,7 +84,7 @@ class Handler(cgi.DebugHandler):
             raise OGCException('Operation "%s" not supported.' % request, 'OperationNotSupported')
         response = requesthandler(ogcparams)
         req.set_header('Content-Type', response.content_type)
-        req.set_header('Content-Length', str(len(response.content))
+        req.set_header('Content-Length', str(len(response.content)))
         req.write(response.content)
 
     def traceback(self, req):
@@ -100,7 +100,7 @@ class Handler(cgi.DebugHandler):
             eh = ExceptionHandler111(self.debug)
         response = eh.getresponse(reqparams)
         req.set_header('Content-Type', response.content_type)
-        req.set_header('Content-Length', str(len(response.content))
+        req.set_header('Content-Length', str(len(response.content)))
         req.write(response.content)
 
 def lowerparams(params):