diff --git a/src/apps/api/serializers/competitions.py b/src/apps/api/serializers/competitions.py
index 7006529aa..4d856b698 100644
--- a/src/apps/api/serializers/competitions.py
+++ b/src/apps/api/serializers/competitions.py
@@ -24,6 +24,7 @@ class PhaseSerializer(WritableNestedModelSerializer):
     tasks = serializers.SlugRelatedField(queryset=Task.objects.all(), required=True, allow_null=False, slug_field='key',
                                          many=True)
     status = serializers.SerializerMethodField()
+    is_final_phase = serializers.SerializerMethodField()
 
     class Meta:
         model = Phase
@@ -48,6 +49,14 @@ class Meta:
             'is_final_phase',
         )
 
+    def get_is_final_phase(self, obj):
+        if len(obj.competition.phases.all()) > 1:
+            return obj.is_final_phase
+        elif len(obj.competition.phases.all()) == 1:
+            obj.is_final_phase = True
+            obj.save()
+            return obj.is_final_phase
+
     def get_status(self, obj):
 
         now = datetime.now().replace(tzinfo=None)