diff --git a/core/src/avm2/globals/flash/text/engine/TextLineMirrorRegion.as b/core/src/avm2/globals/flash/text/engine/TextLineMirrorRegion.as
new file mode 100644
index 000000000..7022a94f4
--- /dev/null
+++ b/core/src/avm2/globals/flash/text/engine/TextLineMirrorRegion.as
@@ -0,0 +1,8 @@
+package flash.text.engine {
+    [API("662")]
+    public final class TextLineMirrorRegion {
+        public function TextLineMirrorRegion() {
+            throw new ArgumentError("Error #2012: TextLineMirrorRegion$ class cannot be instantiated.", 2012);
+        }
+    }
+}
diff --git a/core/src/avm2/globals/globals.as b/core/src/avm2/globals/globals.as
index 5ed27eea1..df15fe632 100644
--- a/core/src/avm2/globals/globals.as
+++ b/core/src/avm2/globals/globals.as
@@ -390,6 +390,7 @@ include "flash/text/engine/TextBlock.as"
 include "flash/text/engine/TextElement.as"
 include "flash/text/engine/TextLine.as"
 include "flash/text/engine/TextLineCreationResult.as"
+include "flash/text/engine/TextLineMirrorRegion.as"
 include "flash/text/engine/TextLineValidity.as"
 include "flash/text/engine/TextRotation.as"
 include "flash/text/engine/TypographicCase.as"