diff --git a/lib/linguist/heuristics.rb b/lib/linguist/heuristics.rb
index 0d0b8338..69dcb395 100644
--- a/lib/linguist/heuristics.rb
+++ b/lib/linguist/heuristics.rb
@@ -165,5 +165,13 @@ module Linguist
         Language["text"]
       end
     end
+
+    disambiguate "TypeScript", "XML" do |data|
+      if data.include?("<TS ")
+        Language["XML"]
+      else
+        Language["TypeScript"]
+      end
+    end
   end
 end
diff --git a/test/test_heuristics.rb b/test/test_heuristics.rb
index 4b208770..20e41ac9 100644
--- a/test/test_heuristics.rb
+++ b/test/test_heuristics.rb
@@ -143,4 +143,11 @@ class TestHeuristcs < Test::Unit::TestCase
       "LoomScript" => "LoomScript/HelloWorld.ls"
     })
   end
+
+  def test_ts_by_heuristics
+    assert_heuristics({
+      "TypeScript" => all_fixtures("TypeScript", "*.ts"),
+      "XML" => all_fixtures("XML", "*.ts")
+    })
+  end
 end