diff --git a/intl/uconv/ucvcn/nsBIG5ToUnicode.cpp b/intl/uconv/ucvcn/nsBIG5ToUnicode.cpp
index 72605dc5a7a6..44f3ee3af8f2 100644
--- a/intl/uconv/ucvcn/nsBIG5ToUnicode.cpp
+++ b/intl/uconv/ucvcn/nsBIG5ToUnicode.cpp
@@ -27,8 +27,9 @@ static PRUint16 g_BIG5MappingTable[] = {
 };
 
 static PRInt16 g_BIG5ShiftTable[] =  {
-  1, u1ByteCharset ,
-  ShiftCell(0,0,0,0,0,0,0,0)
+  2, uMultibytesCharset,  
+  ShiftCell(u1ByteChar,   1, 0x00, 0x7F, 0x00, 0x00, 0x00, 0x7F),
+  ShiftCell(u2BytesChar,  2, 0xA1, 0xFE, 0xA1, 0x40, 0xFE, 0xFE)
 };
 
 //----------------------------------------------------------------------
diff --git a/intl/uconv/ucvcn/nsUnicodeToBIG5.cpp b/intl/uconv/ucvcn/nsUnicodeToBIG5.cpp
index e8da1f8f86bf..46401e2e33cd 100644
--- a/intl/uconv/ucvcn/nsUnicodeToBIG5.cpp
+++ b/intl/uconv/ucvcn/nsUnicodeToBIG5.cpp
@@ -27,8 +27,9 @@ static PRUint16 g_BIG5MappingTable[] = {
 };
 
 static PRInt16 g_BIG5ShiftTable[] =  {
-  1, u1ByteCharset ,
-  ShiftCell(0,0,0,0,0,0,0,0)
+  2, uMultibytesCharset,  
+  ShiftCell(u1ByteChar,   1, 0x00, 0x7F, 0x00, 0x00, 0x00, 0x7F),
+  ShiftCell(u2BytesChar,  2, 0xA1, 0xFE, 0xA1, 0x40, 0xFE, 0xFE)
 };
 
 //----------------------------------------------------------------------