diff --git a/mozilla/intl/unicharutil/public/nsIUBidiUtils.h b/mozilla/intl/unicharutil/public/nsIUBidiUtils.h
index 50e56d95320..92b44745ce5 100644
--- a/mozilla/intl/unicharutil/public/nsIUBidiUtils.h
+++ b/mozilla/intl/unicharutil/public/nsIUBidiUtils.h
@@ -275,8 +275,11 @@ class nsIUBidiUtils : public nsISupports {
 #define END_HINDI_DIGITS                0x0669
 #define START_ARABIC_DIGITS             0x0030
 #define END_ARABIC_DIGITS               0x0039
+#define START_FARSI_DIGITS              0x06f0
+#define END_FARSI_DIGITS                0x06f9
 #define IS_HINDI_DIGIT(u)   ( ( (u) >= START_HINDI_DIGITS )  && ( (u) <= END_HINDI_DIGITS ) )
 #define IS_ARABIC_DIGIT(u)  ( ( (u) >= START_ARABIC_DIGITS ) && ( (u) <= END_ARABIC_DIGITS ) )
+#define IS_FARSI_DIGIT(u)  ( ( (u) >= START_FARSI_DIGITS ) && ( (u) <= END_FARSI_DIGITS ) )
 
 #define IS_BIDI_DIACRITIC(u) ( \
   ( (u) >= 0x0591 && (u) <= 0x05A1) || ( (u) >= 0x05A3 && (u) <= 0x05B9) \
@@ -291,7 +294,7 @@ class nsIUBidiUtils : public nsISupports {
 #define IS_FE_CHAR(c) (((0xfb50 <= (c)) && ((c)<= 0xfbFF)) \
                        || ((0xfe70 <= (c)) && ((c)<= 0xfeFC)))
 #define IS_ARABIC_CHAR(c) ((0x0600 <= (c)) && ((c)<= 0x06FF))
-#define IS_ARABIC_ALPHABETIC(c) (IS_ARABIC_CHAR(c) && !IS_HINDI_DIGIT(c))
+#define IS_ARABIC_ALPHABETIC(c) (IS_ARABIC_CHAR(c) && !(IS_HINDI_DIGIT(c) || IS_FARSI_DIGIT(c)))
 
 #define CHAR_IS_BIDI(c) ( (IS_HINDI_DIGIT(c) ) || (IS_HEBREW_CHAR(c) ) \
                         || (IS_06_CHAR(c) ) || (IS_FE_CHAR(c) ) )