diff --git a/app/models/concerns/category_hashtag.rb b/app/models/concerns/category_hashtag.rb
index fe97b0252..8f2d807fb 100644
--- a/app/models/concerns/category_hashtag.rb
+++ b/app/models/concerns/category_hashtag.rb
@@ -5,7 +5,7 @@ module CategoryHashtag
 
   class_methods do
     def query_from_hashtag_slug(category_slug)
-      parent_slug, child_slug = category_slug.split(":", 2)
+      parent_slug, child_slug = category_slug.split(SEPARATOR, 2)
 
       category = Category.where(slug: parent_slug, parent_category_id: nil)
 
diff --git a/spec/components/concern/category_hashtag_spec.rb b/spec/components/concern/category_hashtag_spec.rb
index 3fe10ba84..be60931f7 100644
--- a/spec/components/concern/category_hashtag_spec.rb
+++ b/spec/components/concern/category_hashtag_spec.rb
@@ -11,7 +11,7 @@ describe CategoryHashtag do
     end
 
     it "should return the right result for a parent and child category slug" do
-      expect(Category.query_from_hashtag_slug("#{parent_category.slug}:#{child_category.slug}"))
+      expect(Category.query_from_hashtag_slug("#{parent_category.slug}#{CategoryHashtag::SEPARATOR}#{child_category.slug}"))
         .to eq(child_category)
     end
 
@@ -20,7 +20,7 @@ describe CategoryHashtag do
     end
 
     it "should return nil for incorrect parent and child category slug" do
-      expect(Category.query_from_hashtag_slug("random-slug:random-slug")).to eq(nil)
+      expect(Category.query_from_hashtag_slug("random-slug#{CategoryHashtag::SEPARATOR}random-slug")).to eq(nil)
     end
   end
 end