diff --git a/CHANGELOG.md b/CHANGELOG.md
index b91c19fabe..0e1cdc48c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # v1.12
 
+## Release v1.12.4 - 2021/05/26
+
+### Bug fix
+
+* in_tail: Fix a bug that refresh_watcher fails to handle file rotations
+
 ## Release v1.12.3 - 2021/04/23
 
 ### Enhancement
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/lib/fluent/version.rb b/lib/fluent/version.rb
index 7413ca114f..4325fde1f9 100644
--- a/lib/fluent/version.rb
+++ b/lib/fluent/version.rb
@@ -16,6 +16,6 @@
 
 module Fluent
 
-  VERSION = '1.12.3'
+  VERSION = '1.12.4'
 
 end
diff --git a/test/plugin/in_tail/test_position_file.rb b/test/plugin/in_tail/test_position_file.rb
index eb07eeb4b9..0715ab2996 100644
--- a/test/plugin/in_tail/test_position_file.rb
+++ b/test/plugin/in_tail/test_position_file.rb
@@ -282,4 +282,58 @@ def build_files(file)
       assert_equal 2, f.read_inode
     end
   end
+
+  sub_test_case "TargetInfo equality rules" do
+    sub_test_case "== operator" 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_not_equal
+        t1 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1234)
+        t2 = Fluent::Plugin::TailInput::TargetInfo.new("test2", 1234)
+
+        assert_not_equal t1, t2
+      end
+    end
+
+    sub_test_case "eql? method" do
+      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_not_eql?
+        t1 = Fluent::Plugin::TailInput::TargetInfo.new("test2", 1234)
+        t2 = Fluent::Plugin::TailInput::TargetInfo.new("test3", 1234)
+
+        assert do
+          !t1.eql? t2
+        end
+      end
+    end
+
+    sub_test_case "hash" do
+      def test_equal
+        t1 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1234)
+        t2 = Fluent::Plugin::TailInput::TargetInfo.new("test", 7321)
+
+        assert_equal t1.hash, t2.hash
+      end
+
+      def test_not_equal
+        t1 = Fluent::Plugin::TailInput::TargetInfo.new("test", 1234)
+        t2 = Fluent::Plugin::TailInput::TargetInfo.new("test2", 1234)
+
+        assert_not_equal t1.hash, t2.hash
+      end
+    end
+  end
 end