diff --git a/Lib/lib2to3/pgen2/driver.py b/Lib/lib2to3/pgen2/driver.py
index 8a94f0d4291..b08f1d71c72 100644
--- a/Lib/lib2to3/pgen2/driver.py
+++ b/Lib/lib2to3/pgen2/driver.py
@@ -126,7 +126,10 @@ def load_grammar(gt="Grammar.txt", gp=None,
         g = pgen.generate_grammar(gt)
         if save:
             logger.info("Writing grammar tables to %s", gp)
-            g.dump(gp)
+            try:
+                g.dump(gp)
+            except IOError, e:
+                logger.info("Writing failed:"+str(e))
     else:
         g = grammar.Grammar()
         g.load(gp)