diff --git a/CHANGELOG b/CHANGELOG
index 20bf42ac37..fc8f44a4ca 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* Sanitize report file extension
+
 Version 3.0.0 - 2013-10-21
 * Bug fixes (see mercurial logs for details)
 * Add factor on number widgets
diff --git a/tryton/action/main.py b/tryton/action/main.py
index 4913b04b9c..d06afb0052 100644
--- a/tryton/action/main.py
+++ b/tryton/action/main.py
@@ -42,7 +42,8 @@ class Action(object):
         dtemp = tempfile.mkdtemp(prefix='tryton_')
         fp_name = os.path.join(dtemp,
             name.replace(os.sep, '_').replace(os.altsep or os.sep, '_')
-            + os.extsep + type)
+            + os.extsep
+            + type.replace(os.sep, '_').replace(os.altsep or os.sep, '_'))
         with open(fp_name, 'wb') as file_d:
             file_d.write(data)
         if email_print: