diff --git a/arcscripts/sdna_environment.py b/arcscripts/sdna_environment.py
index 04d572c..2694ee0 100644
--- a/arcscripts/sdna_environment.py
+++ b/arcscripts/sdna_environment.py
@@ -545,6 +545,7 @@ def AddRowGeomItem(self,geomitem):
             
     def Close(self):
         self.env.SetProgressorPosition(self.numitems)
+        self.writer.close()
         del self.writer
 
 class SdnaArcpyEnvironment(SdnaEnvironment):