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-rw-r--r--tools/mountstats/mountstats.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/mountstats/mountstats.py b/tools/mountstats/mountstats.py
index c8cb718..51b4c76 100644
--- a/tools/mountstats/mountstats.py
+++ b/tools/mountstats/mountstats.py
@@ -594,7 +594,7 @@ def print_iostat_summary(old, new, devices, time):
for device in devices:
stats = DeviceData()
stats.parse_stats(new[device])
- if not old:
+ if not old or device not in old:
stats.display_iostats(time)
else:
old_stats = DeviceData()