diff --git a/app/services/random_topic_selector.rb b/app/services/random_topic_selector.rb
index 1ac2d8500a9..a484c91be15 100644
--- a/app/services/random_topic_selector.rb
+++ b/app/services/random_topic_selector.rb
@@ -91,4 +91,8 @@ class RandomTopicSelector
     "random_topic_cache_#{category&.id}"
   end
 
+  def self.clear_cache!
+    $redis.delete_prefixed(cache_key)
+  end
+
 end
diff --git a/spec/serializers/topic_view_serializer_spec.rb b/spec/serializers/topic_view_serializer_spec.rb
index 8a6e27b0561..5b50522b890 100644
--- a/spec/serializers/topic_view_serializer_spec.rb
+++ b/spec/serializers/topic_view_serializer_spec.rb
@@ -3,7 +3,12 @@ require 'rails_helper'
 describe TopicViewSerializer do
   def serialize_topic(topic, user_arg)
     topic_view = TopicView.new(topic.id, user_arg)
-    described_class.new(topic_view, scope: Guardian.new(user_arg), root: false).as_json
+    TopicViewSerializer.new(topic_view, scope: Guardian.new(user_arg), root: false).as_json
+  end
+
+  before do
+    # ensure no suggested ids are cached cause that can muck up suggested
+    RandomTopicSelector.clear_cache!
   end
 
   let(:topic) { Fabricate(:topic) }