diff --git a/app/serializers/rest/instance_serializer.rb b/app/serializers/rest/instance_serializer.rb
index 5a06f51e59..7417826805 100644
--- a/app/serializers/rest/instance_serializer.rb
+++ b/app/serializers/rest/instance_serializer.rb
@@ -74,6 +74,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
         max_characters_per_option: PollValidator::MAX_OPTION_CHARS,
         min_expiration: PollValidator::MIN_EXPIRATION,
         max_expiration: PollValidator::MAX_EXPIRATION,
+        allow_image: true,
       },
 
       translation: {
diff --git a/app/serializers/rest/v1/instance_serializer.rb b/app/serializers/rest/v1/instance_serializer.rb
index 537132375e..c887635d1e 100644
--- a/app/serializers/rest/v1/instance_serializer.rb
+++ b/app/serializers/rest/v1/instance_serializer.rb
@@ -84,6 +84,7 @@ class REST::V1::InstanceSerializer < ActiveModel::Serializer
         max_characters_per_option: PollValidator::MAX_OPTION_CHARS,
         min_expiration: PollValidator::MIN_EXPIRATION,
         max_expiration: PollValidator::MAX_EXPIRATION,
+        allow_image: true,
       },
 
       emoji_reactions: {