diff --git a/src/main/java/no/nibio/model/maizepheno/MaizePhenologyModel.java b/src/main/java/no/nibio/model/maizepheno/MaizePhenologyModel.java
index 4a63ea227e6c437c8846d5b41e481247da4f7051..c0b7c1bc5d3ab42961dacf89f3c64e367adb17e2 100644
--- a/src/main/java/no/nibio/model/maizepheno/MaizePhenologyModel.java
+++ b/src/main/java/no/nibio/model/maizepheno/MaizePhenologyModel.java
@@ -20,6 +20,7 @@
 package no.nibio.model.maizepheno;
 
 import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -28,6 +29,7 @@ import java.util.Collections;
 import java.util.Date;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Set;
 import java.util.TimeZone;
 import java.util.stream.Collectors;
@@ -84,7 +86,10 @@ public class MaizePhenologyModel extends I18nImpl implements Model{
         Date lastDate = this.dataMatrix.getLastDateWithParameterValue(DataMatrix.TND);
         Double heatSum = 0.0;
         List<Result> retVal = new ArrayList<>();
-        DecimalFormat dFormat = new DecimalFormat("###.##");
+
+        DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.getDefault());
+        symbols.setDecimalSeparator('.');
+        DecimalFormat dFormat = new DecimalFormat("###.##", symbols);
         while(!currentDate.after(lastDate))
         {
             Result result = new ResultImpl();