diff --git a/mozilla/layout/html/style/src/nsCSSProps2.cpp b/mozilla/layout/html/style/src/nsCSSProps2.cpp
index 3c7bffd6753..1d4ec0e3bf1 100644
--- a/mozilla/layout/html/style/src/nsCSSProps2.cpp
+++ b/mozilla/layout/html/style/src/nsCSSProps2.cpp
@@ -355,6 +355,8 @@ const PRInt32 nsCSSProps::kTextAlignKTable[] = {
   KEYWORD_RIGHT, NS_STYLE_TEXT_ALIGN_RIGHT,
   KEYWORD_CENTER, NS_STYLE_TEXT_ALIGN_CENTER,
   KEYWORD_JUSTIFY, NS_STYLE_TEXT_ALIGN_JUSTIFY,
+  KEYWORD__MOZ_CENTER, NS_STYLE_TEXT_ALIGN_MOZ_CENTER,
+  KEYWORD__MOZ_RIGHT, NS_STYLE_TEXT_ALIGN_MOZ_RIGHT,
   -1,-1
 };