diff --git a/app/src/main/java/net/foucry/pilldroid/Medicament.java b/app/src/main/java/net/foucry/pilldroid/Medicament.java
index 102e09a..93749a2 100644
--- a/app/src/main/java/net/foucry/pilldroid/Medicament.java
+++ b/app/src/main/java/net/foucry/pilldroid/Medicament.java
@@ -163,8 +163,10 @@ public class Medicament implements Serializable {
     void newStock() {
         Date lastUpdate = new Date(getDateLastUpdate());
         int numberOfDays = nbOfDaysBetweenDateAndToday(lastUpdate);
-        double takeDuringPeriod = this.prise * numberOfDays;
-        setStock(getStock() - takeDuringPeriod);
-        setDateLastUpdate(dateAtNoon(new Date()).getTime());
+        if (numberOfDays > 0) {
+            double takeDuringPeriod = this.prise * numberOfDays;
+            setStock(getStock() - takeDuringPeriod);
+            setDateLastUpdate(new Date().getTime());
+        }
     }
 }
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