diff --git a/app/assets/javascripts/discourse/components/choose-topic.js.es6 b/app/assets/javascripts/discourse/components/choose-topic.js.es6
index 4f35e90e203..3d787d58431 100644
--- a/app/assets/javascripts/discourse/components/choose-topic.js.es6
+++ b/app/assets/javascripts/discourse/components/choose-topic.js.es6
@@ -32,20 +32,22 @@ export default Ember.Component.extend({
       return;
     }
 
-    searchForTerm(title, { typeFilter: "topic", searchForId: true }).then(
-      function(results) {
-        if (results && results.posts && results.posts.length > 0) {
-          self.set(
-            "topics",
-            results.posts
-              .mapBy("topic")
-              .filter(t => t.get("id") !== currentTopicId)
-          );
-        } else {
-          self.setProperties({ topics: null, loading: false });
-        }
+    searchForTerm(title, {
+      typeFilter: "topic",
+      searchForId: true,
+      restrictToArchetype: "regular"
+    }).then(function(results) {
+      if (results && results.posts && results.posts.length > 0) {
+        self.set(
+          "topics",
+          results.posts
+            .mapBy("topic")
+            .filter(t => t.get("id") !== currentTopicId)
+        );
+      } else {
+        self.setProperties({ topics: null, loading: false });
       }
-    );
+    });
   }, 300),
 
   actions: {
diff --git a/app/assets/javascripts/discourse/lib/search.js.es6 b/app/assets/javascripts/discourse/lib/search.js.es6
index 752776a9353..8fab105cfe1 100644
--- a/app/assets/javascripts/discourse/lib/search.js.es6
+++ b/app/assets/javascripts/discourse/lib/search.js.es6
@@ -107,6 +107,8 @@ export function searchForTerm(term, opts) {
   const data = { term: term, include_blurbs: "true" };
   if (opts.typeFilter) data.type_filter = opts.typeFilter;
   if (opts.searchForId) data.search_for_id = true;
+  if (opts.restrictToArchetype)
+    data.restrict_to_archetype = opts.restrictToArchetype;
 
   if (opts.searchContext) {
     data.search_context = {
diff --git a/app/controllers/search_controller.rb b/app/controllers/search_controller.rb
index b1fc8b0f5a2..621788f7ecd 100644
--- a/app/controllers/search_controller.rb
+++ b/app/controllers/search_controller.rb
@@ -68,6 +68,7 @@ class SearchController < ApplicationController
     search_args[:search_type] = :header
     search_args[:ip_address] = request.remote_ip
     search_args[:user_id] = current_user.id if current_user.present?
+    search_args[:restrict_to_archetype] = params[:restrict_to_archetype] if params[:restrict_to_archetype].present?
 
     search = Search.new(params[:term], search_args)
     result = search.execute
diff --git a/lib/search.rb b/lib/search.rb
index e26f8c29f15..61ccf79d91d 100644
--- a/lib/search.rb
+++ b/lib/search.rb
@@ -227,7 +227,7 @@ class Search
     end
 
     # If the term is a number or url to a topic, just include that topic
-    if @opts[:search_for_id] && @results.type_filter == 'topic'
+    if @opts[:search_for_id] && (@results.type_filter == 'topic' || @results.type_filter == 'private_messages')
       if @term =~ /^\d+$/
         single_topic(@term.to_i)
       else
@@ -629,7 +629,14 @@ class Search
 
   # If we're searching for a single topic
   def single_topic(id)
-    post = Post.find_by(topic_id: id, post_number: 1)
+    if @opts[:restrict_to_archetype].present?
+      archetype = @opts[:restrict_to_archetype] == Archetype.default ? Archetype.default : Archetype.private_message
+      post = Post.joins(:topic)
+        .where("topics.id = :id AND topics.archetype = :archetype AND posts.post_number = 1", id: id, archetype: archetype)
+        .first
+    else
+      post = Post.find_by(topic_id: id, post_number: 1)
+    end
     return nil unless @guardian.can_see?(post)
 
     @results.add(post)
diff --git a/spec/components/search_spec.rb b/spec/components/search_spec.rb
index 877812d9d2e..ce6088a0a99 100644
--- a/spec/components/search_spec.rb
+++ b/spec/components/search_spec.rb
@@ -341,12 +341,32 @@ describe Search do
     end
 
     context "search for a topic by url" do
-      let(:result) { Search.execute(topic.relative_url, search_for_id: true, type_filter: 'topic') }
-
       it 'returns the topic' do
+        result = Search.execute(topic.relative_url, search_for_id: true, type_filter: 'topic')
         expect(result.posts.length).to eq(1)
         expect(result.posts.first.id).to eq(post.id)
       end
+
+      context 'restrict_to_archetype' do
+        let(:personal_message) { Fabricate(:private_message_topic) }
+        let!(:p1) { Fabricate(:post, topic: personal_message, post_number: 1) }
+
+        it 'restricts result to topics' do
+          result = Search.execute(personal_message.relative_url, search_for_id: true, type_filter: 'topic', restrict_to_archetype: Archetype.default)
+          expect(result.posts.length).to eq(0)
+
+          result = Search.execute(topic.relative_url, search_for_id: true, type_filter: 'topic', restrict_to_archetype: Archetype.default)
+          expect(result.posts.length).to eq(1)
+        end
+
+        it 'restricts result to messages' do
+          result = Search.execute(topic.relative_url, search_for_id: true, type_filter: 'private_messages', guardian: Guardian.new(Fabricate(:admin)), restrict_to_archetype: Archetype.private_message)
+          expect(result.posts.length).to eq(0)
+
+          result = Search.execute(personal_message.relative_url, search_for_id: true, type_filter: 'private_messages', guardian: Guardian.new(Fabricate(:admin)), restrict_to_archetype: Archetype.private_message)
+          expect(result.posts.length).to eq(1)
+        end
+      end
     end
 
     context 'security' do