1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/pybootchartgui/pybootchartgui/main.py.in b/scripts/pybootchartgui/pybootchartgui/main.py.in
index cc9c40b178..e9d2c74f1e 100644
--- a/scripts/pybootchartgui/pybootchartgui/main.py.in
+++ b/scripts/pybootchartgui/pybootchartgui/main.py.in
@@ -155,11 +155,13 @@ def main(argv=None):
                         filename = _get_filename(options.output)
                         res_list = parsing.split_res(res, options.num)
                         n = 1
+                        width = len(str(len(res_list)))
+                        s = "_%%0%dd." % width
                         for r in res_list:
                                 if len(res_list) == 1:
                                         f = filename + "." + options.format
                                 else:
-                                        f = filename + "_" + str(n) + "." + options.format
+                                        f = filename + s % n + options.format
                                         n = n + 1
                                 def render():
                                         batch.render(writer, r, options, f)