diff --git a/format_spec_file b/format_spec_file
index da13fda..b97f59c 100644
--- a/format_spec_file
+++ b/format_spec_file
@@ -21,6 +21,8 @@ done
 RETURN=0
 for i in *.spec; do
   /usr/lib/obs/service/format_spec_file.files/prepare_spec "$i" > "$MYOUTDIR/$i" || RETURN=1
+  # remove all file files which are indendical to committed files
+  cmp "$i" "$MYOUTDIR/$i" && rm "$MYOUTDIR/$i"
 done
 
 exit $RETURN
diff --git a/obs-service-format_spec_file.changes b/obs-service-format_spec_file.changes
index 7d0c5c9..f4040cc 100644
--- a/obs-service-format_spec_file.changes
+++ b/obs-service-format_spec_file.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed May 25 15:34:28 UTC 2011 - adrian@suse.de
+
+- do not generate new spec files when no changes happened
+
 -------------------------------------------------------------------
 Wed May 25 14:00:35 CEST 2011 - ro@suse.de
 
diff --git a/obs-service-format_spec_file.spec b/obs-service-format_spec_file.spec
index 5fe92e6..93ac8c1 100644
--- a/obs-service-format_spec_file.spec
+++ b/obs-service-format_spec_file.spec
@@ -1,22 +1,3 @@
-#
-# spec file for package obs-service-format_spec_file
-#
-# Copyright (c) 2011 SUSE LINUX Products GmbH, Nuernberg, Germany.
-#
-# All modifications and additions to the file contributed by third parties
-# remain the property of their copyright owners, unless otherwise agreed
-# upon. The license for this file, and modifications and additions to the
-# file, is the same license as for the pristine package itself (unless the
-# license for the pristine package is not an Open Source License, in which
-# case the license is the MIT License). An "Open Source License" is a
-# license that conforms to the Open Source Definition (Version 1.9)
-# published by the Open Source Initiative.
-
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
-#
-
-
-
 Name:           obs-service-format_spec_file
 License:        GPL v2 or later
 Group:          Development/Tools/Building
@@ -55,4 +36,3 @@ install -m 0755 %{SOURCE2} $RPM_BUILD_ROOT/usr/lib/obs/service/format_spec_file.
 %defattr(-,root,root)
 %dir /usr/lib/obs
 /usr/lib/obs/service
-%changelog