diff --git a/src/main/java/org/alfresco/service/cmr/search/Interval.java b/src/main/java/org/alfresco/service/cmr/search/Interval.java
index 4fc0e1addb..bc0855d4c8 100644
--- a/src/main/java/org/alfresco/service/cmr/search/Interval.java
+++ b/src/main/java/org/alfresco/service/cmr/search/Interval.java
@@ -29,7 +29,9 @@ import org.codehaus.jackson.annotate.JsonCreator;
 import org.codehaus.jackson.annotate.JsonProperty;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Parameters used for a search Interval.
@@ -38,17 +40,17 @@ public class Interval
 {
     private final String field;
     private final String label;
-    private final List<IntervalSet> sets;
+    private final Set<IntervalSet> sets;
 
     @JsonCreator
     public Interval(
                 @JsonProperty("field") String field,
                 @JsonProperty("label") String label,
-                @JsonProperty("sets") List<IntervalSet> sets)
+                @JsonProperty("sets")  Set<IntervalSet> sets)
     {
         this.field = field;
         this.label = label;
-        this.sets = sets == null ? new ArrayList<>() :sets;
+        this.sets = sets == null ? new HashSet() :sets;
     }
 
     public String getField()
@@ -61,7 +63,7 @@ public class Interval
         return label;
     }
 
-    public List<IntervalSet> getSets()
+    public Set<IntervalSet> getSets()
     {
         return sets;
     }
diff --git a/src/main/java/org/alfresco/service/cmr/search/IntervalParameters.java b/src/main/java/org/alfresco/service/cmr/search/IntervalParameters.java
index 3ca6a1da37..f696ea3f6f 100644
--- a/src/main/java/org/alfresco/service/cmr/search/IntervalParameters.java
+++ b/src/main/java/org/alfresco/service/cmr/search/IntervalParameters.java
@@ -30,6 +30,7 @@ import org.codehaus.jackson.annotate.JsonCreator;
 import org.codehaus.jackson.annotate.JsonProperty;
 
 import java.util.List;
+import java.util.Set;
 
 /**
  * Parameters used for search Intervals.
@@ -37,19 +38,19 @@ import java.util.List;
 @AlfrescoPublicApi
 public class IntervalParameters
 {
-    private final List<IntervalSet> sets;
+    private final Set<IntervalSet> sets;
     private final List<Interval> intervals;
 
     @JsonCreator
     public IntervalParameters(
-                @JsonProperty("sets") List<IntervalSet> sets,
+                @JsonProperty("sets") Set<IntervalSet> sets,
                 @JsonProperty("intervals") List<Interval> intervals)
     {
         this.sets = sets;
         this.intervals = intervals;
     }
 
-    public List<IntervalSet> getSets()
+    public Set<IntervalSet> getSets()
     {
         return sets;
     }
diff --git a/src/main/java/org/alfresco/service/cmr/search/IntervalSet.java b/src/main/java/org/alfresco/service/cmr/search/IntervalSet.java
index 17c3c73326..70b04db93f 100644
--- a/src/main/java/org/alfresco/service/cmr/search/IntervalSet.java
+++ b/src/main/java/org/alfresco/service/cmr/search/IntervalSet.java
@@ -37,7 +37,7 @@ public class IntervalSet
 {
     private final String start;
     private final String end;
-    private final String label;
+    private String label;
     private final boolean startInclusive;
     private final boolean endInclusive;
 
@@ -71,6 +71,11 @@ public class IntervalSet
         return label;
     }
 
+    public void setLabel(String label)
+    {
+        this.label = label;
+    }
+
     public boolean isStartInclusive()
     {
         return startInclusive;
@@ -128,4 +133,38 @@ public class IntervalSet
                     ", endInclusive=" + endInclusive +
                     '}';
     }
+
+    @Override
+    public boolean equals(Object o)
+    {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        IntervalSet that = (IntervalSet) o;
+
+        if (startInclusive != that.startInclusive)
+            return false;
+        if (endInclusive != that.endInclusive)
+            return false;
+        if (start != null ? !start.equals(that.start) : that.start != null)
+            return false;
+        if (end != null ? !end.equals(that.end) : that.end != null)
+            return false;
+        if (label != null ? !label.equals(that.label) : that.label != null)
+            return false;
+
+        return true;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        int result = start != null ? start.hashCode() : 0;
+        result = 31 * result + (end != null ? end.hashCode() : 0);
+        result = 31 * result + (startInclusive ? 1 : 0);
+        result = 31 * result + (endInclusive ? 1 : 0);
+        return result;
+    }
 }