diff --git a/src/fr/devinsy/statoolinfos/core/Service.java b/src/fr/devinsy/statoolinfos/core/Service.java
index 065f857..f5d48f4 100644
--- a/src/fr/devinsy/statoolinfos/core/Service.java
+++ b/src/fr/devinsy/statoolinfos/core/Service.java
@@ -489,7 +489,8 @@ public class Service extends PathPropertyList
 
         MonthValues values = getMetricMonthValues("metrics.service.users");
 
-        values = values.extract(YearMonth.now().minusMonths(1), YearMonth.now().minusMonths(1));
+        YearMonth previousMonth = YearMonth.now().minusMonths(1);
+        values = values.extract(previousMonth, previousMonth);
 
         result = (long) values.sum();