diff --git a/nilmdb/fsck/fsck.py b/nilmdb/fsck/fsck.py
index c170920..91d0835 100644
--- a/nilmdb/fsck/fsck.py
+++ b/nilmdb/fsck/fsck.py
@@ -170,7 +170,7 @@ class Fsck(object):
 
     def check_streams(self):
         ids = self.stream_path.keys()
-        log("checking %d streams\n", len(ids))
+        log("checking %s streams\n", "{:,d}".format(len(ids)))
         with Progress(len(ids)) as pbar:
             for i, sid in enumerate(ids):
                 pbar.update(i)
@@ -306,7 +306,7 @@ class Fsck(object):
 
     def check_intervals(self):
         total_ints = sum(len(x) for x in self.stream_interval.values())
-        log("checking %d intervals\n", total_ints)
+        log("checking %s intervals\n", "{:,d}".format(total_ints))
         done = 0
         with Progress(total_ints) as pbar:
             for sid in self.stream_interval:
@@ -389,7 +389,7 @@ class Fsck(object):
     def check_data(self):
         total_rows = sum(sum((y[3] - y[2]) for y in x)
                          for x in self.stream_interval.values())
-        log("checking %d rows of data\n", total_rows)
+        log("checking %s rows of data\n", "{:,d}".format(total_rows))
         done = 0
         with Progress(total_rows) as pbar:
             for sid in self.stream_interval: