diff --git a/app/services/user_blocker.rb b/app/services/user_blocker.rb
index cda62083c9..01b5896e88 100644
--- a/app/services/user_blocker.rb
+++ b/app/services/user_blocker.rb
@@ -31,8 +31,8 @@ class UserBlocker
   def hide_posts
     return unless @user.trust_level == TrustLevel[0]
 
-    Post.where(user_id: @user.id).update_all(["hidden = true, hidden_reason_id = COALESCE(hidden_reason_id, ?)", Post.hidden_reasons[:new_user_spam_threshold_reached]])
-    topic_ids = Post.where(user_id: @user.id, post_number: 1).pluck(:topic_id)
+    Post.where(user_id: @user.id).where("created_at > ?", 24.hours.ago).update_all(["hidden = true, hidden_reason_id = COALESCE(hidden_reason_id, ?)", Post.hidden_reasons[:new_user_spam_threshold_reached]])
+    topic_ids = Post.where(user_id: @user.id, post_number: 1).where("created_at > ?", 24.hours.ago).pluck(:topic_id)
     Topic.where(id: topic_ids).update_all(visible: false) unless topic_ids.empty?
   end
 
diff --git a/spec/services/user_blocker_spec.rb b/spec/services/user_blocker_spec.rb
index 6761c44b3d..34c0b99fbd 100644
--- a/spec/services/user_blocker_spec.rb
+++ b/spec/services/user_blocker_spec.rb
@@ -118,6 +118,16 @@ describe UserBlocker do
       expect(post.reload).to_not be_hidden
       expect(post.topic.reload).to be_visible
     end
+
+    it "only hides posts from the past 24 hours" do
+      old_post = Fabricate(:post, user: user, created_at: 2.days.ago)
+      subject.block
+      expect(post.reload).to be_hidden
+      expect(post.topic.reload).to_not be_visible
+      old_post.reload
+      expect(old_post).to_not be_hidden
+      expect(old_post.topic).to be_visible
+    end
   end
 
 end