diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/DayAssignment.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/DayAssignment.java
index f147a1dac..601825efb 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/DayAssignment.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/DayAssignment.java
@@ -29,6 +29,7 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;