diff --git a/src/CharacterSets.php b/src/CharacterSets.php
index 160537f..38b91c0 100644
--- a/src/CharacterSets.php
+++ b/src/CharacterSets.php
@@ -48,6 +48,8 @@ class CharacterSets
         'big5-hkscs' => 'ibm-1375_P100-2008',
         'shift_jis' => 'ibm-943_P15A-2003',
         'tis-620' => 'windows-874-2000',
+        'tis620' => 'windows-874-2000',
+        'windows-1252' => 'cp1252',
         'windows-1258' => 'cp1258',
         'windows-936' => 'windows-936-2000',
         'windows-950' => 'windows-950-2000',
diff --git a/test/CharacterSetsTest.php b/test/CharacterSetsTest.php
index 99cb2d3..bf74bb8 100644
--- a/test/CharacterSetsTest.php
+++ b/test/CharacterSetsTest.php
@@ -85,6 +85,18 @@ public function testToUConverterWindows1258(): void
         $this->assertEquals('cp1258', CharacterSets::toUConverter('Windows-1258'));
     }
 
+    public function testToUConverterWindows1252(): void
+    {
+        $this->assertEquals('cp1252', CharacterSets::toUConverter('windows-1252'));
+        $this->assertEquals('cp1252', CharacterSets::toUConverter('Windows-1252'));
+    }
+
+    public function testToUConverterTis620(): void
+    {
+        $this->assertEquals('windows-874-2000', CharacterSets::toUConverter('tis620'));
+        $this->assertEquals('windows-874-2000', CharacterSets::toUConverter('TIS-620'));
+    }
+
     public function testToUConverterPreservesUnambiguousCharsets(): void
     {
         $this->assertEquals('iso-8859-1', CharacterSets::toUConverter('iso-8859-1'));