diff --git a/library/HTMLPurifier/Encoder.php b/library/HTMLPurifier/Encoder.php
index fef9b589..054986ea 100644
--- a/library/HTMLPurifier/Encoder.php
+++ b/library/HTMLPurifier/Encoder.php
@@ -255,7 +255,7 @@ class HTMLPurifier_Encoder
                                 // 7F-9F is not strictly prohibited by XML,
                                 // but it is non-SGML, and thus we don't allow it
                                 (0xA0 <= $mUcs4 && 0xD7FF >= $mUcs4) ||
-                                (0x10000 <= $mUcs4 && 0x10FFFF >= $mUcs4)
+                                (0xE000 <= $mUcs4 && 0x10FFFF >= $mUcs4)
                             )
                         ) {
                             $out .= $char;
diff --git a/tests/HTMLPurifier/EncoderTest.php b/tests/HTMLPurifier/EncoderTest.php
index 819d4b11..c43e4240 100644
--- a/tests/HTMLPurifier/EncoderTest.php
+++ b/tests/HTMLPurifier/EncoderTest.php
@@ -23,6 +23,7 @@ class HTMLPurifier_EncoderTest extends HTMLPurifier_Harness
         $this->assertCleanUTF8('Normal string.');
         $this->assertCleanUTF8("Test\tAllowed\nControl\rCharacters");
         $this->assertCleanUTF8("null byte: \0", 'null byte: ');
+        $this->assertCleanUTF8("あ（い）う（え）お\0", "あ（い）う（え）お"); // test for issue #122
         $this->assertCleanUTF8("\1\2\3\4\5\6\7", '');
         $this->assertCleanUTF8("\x7F", ''); // one byte invalid SGML char
         $this->assertCleanUTF8("\xC2\x80", ''); // two byte invalid SGML