diff --git a/apps/gallery/serializers.py b/apps/gallery/serializers.py
index dad6e2de..e1a259a1 100644
--- a/apps/gallery/serializers.py
+++ b/apps/gallery/serializers.py
@@ -90,6 +90,10 @@ class EstablishmentGallerySerializer(serializers.ModelSerializer):
         instance.created_by = self.context['request'].user
         instance.establishment_set.add(establishment)
         instance.save()
+        if is_main:
+            EstablishmentGallery.objects.filter(
+                    establishment=establishment
+            ).update(is_main=False)  # reset all before setting True on some instance
         EstablishmentGallery.objects.filter(
             image=instance
         ).update(is_main=is_main)
@@ -100,6 +104,11 @@ class EstablishmentGallerySerializer(serializers.ModelSerializer):
             instance.set_pubic(validated_data.get('is_public', True))
         if 'is_main' in validated_data:
             is_main = validated_data.pop('is_main')
+            if is_main:
+                establishment = instance.establishment_gallery.all()[0].establishment
+                EstablishmentGallery.objects.filter(
+                    establishment=establishment
+                ).update(is_main=False)  # reset all before setting True on some instance
             EstablishmentGallery.objects.filter(
                 image=instance
             ).update(is_main=is_main)