diff --git a/lib/fluent/plugin/in_tail/position_file.rb b/lib/fluent/plugin/in_tail/position_file.rb
index 88614d2802..faf27e95ee 100644
--- a/lib/fluent/plugin/in_tail/position_file.rb
+++ b/lib/fluent/plugin/in_tail/position_file.rb
@@ -248,6 +248,20 @@ def read_inode
       end
     end
 
-    TargetInfo = Struct.new(:path, :ino)
+    TargetInfo = Struct.new(:path, :ino) do
+      def ==(other)
+        return false unless other.is_a?(TargetInfo)
+        self.path == other.path
+      end
+
+      def hash
+        self.path.hash
+      end
+
+      def eql?(other)
+        return false unless other.is_a?(TargetInfo)
+        self.path == other.path
+      end
+    end
   end
 end
diff --git a/test/plugin/in_tail/test_position_file.rb b/test/plugin/in_tail/test_position_file.rb
index eb07eeb4b9..844dd2b38c 100644
--- a/test/plugin/in_tail/test_position_file.rb
+++ b/test/plugin/in_tail/test_position_file.rb
@@ -282,4 +282,29 @@ def build_files(file)
       assert_equal 2, f.read_inode
     end
   end
+
+  sub_test_case "TargetInfo" do
+    def test_equal
+      t1 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1234)
+      t2 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1235)
+
+      assert_equal t1, t2
+    end
+
+    def test_eql?
+      t1 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1234)
+      t2 = Fluent::Plugin::TailInput::TargetInfo.new("test", 5321)
+
+      assert do
+        t1.eql? t2
+      end
+    end
+
+    def test_hash
+      t1 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1234)
+      t2 = Fluent::Plugin::TailInput::TargetInfo.new("test", 7321)
+
+      assert_equal t1.hash, t2.hash
+    end
+  end
 end