diff --git a/plugins/chrony/chrony_status b/plugins/chrony/chrony_status
index 9f2cfe1c..0ce351dd 100755
--- a/plugins/chrony/chrony_status
+++ b/plugins/chrony/chrony_status
@@ -177,7 +177,7 @@ def fetch():
     values = get_values()
     for graph in GRAPHS:
         print('multigraph chrony_{}'.format(graph))
-        if graph == 'stratum' and values[graph] == 0:
+        if graph == 'stratum' and values[graph] == '0':
             print('{}.value U'.format(graph))
         elif graph == 'serverstats':
             for stat in SERVERSTATS: