diff --git a/intl/uconv/ucvja/nsJapaneseToUnicode.cpp b/intl/uconv/ucvja/nsJapaneseToUnicode.cpp
index c45cdea171b2..543776492495 100644
--- a/intl/uconv/ucvja/nsJapaneseToUnicode.cpp
+++ b/intl/uconv/ucvja/nsJapaneseToUnicode.cpp
@@ -169,14 +169,7 @@ NS_IMETHODIMP nsShiftJISToUnicode::Convert(
           case 1: // Index to table
           {
             PRUint8 off = sbIdx[*src];
-
-            // Error handling: in the case where the second octet is not in the
-            // valid ranges 0x40-0x7E 0x80-0xFC, unconsume the invalid octet and
-            // interpret it as the ASCII value. In the case where the second
-            // octet is in the valid range but there is no mapping for the
-            // 2-octet sequence, do not unconsume.
             if(0xFF == off) {
-               src--;
                if (mErrBehavior == kOnError_Signal)
                  goto error_invalidchar;
                *dest++ = SJIS_UNMAPPED;
@@ -198,10 +191,7 @@ NS_IMETHODIMP nsShiftJISToUnicode::Convert(
           case 2: // EUDC
           {
             PRUint8 off = sbIdx[*src];
-
-            // Error handling as in case 1
             if(0xFF == off) {
-               src--;
                if (mErrBehavior == kOnError_Signal)
                  goto error_invalidchar;