diff --git a/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java b/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
index f654199..c289a2f 100644
--- a/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
+++ b/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
@@ -46,7 +46,7 @@ public class PropertyChecker
     public static final String MONTHS = "^\\d*(,\\d*){0,11}$";
     public static final String WEEKS = "^\\d*(,\\d*){0,52}$";
     public static final String DAYS = "^\\d*(,\\d*){0,365}$";
-    public static final String COUNTRY_CODE = "^[A-Z]{2}$";
+    public static final String COUNTRY_CODE = "^[a-z][A-Z]{2}$";
 
     public static final String SUBS = "^subs\\.\\S+$";
     public static final String METRICS_NAME = "^metrics\\.\\S+\\.name$";