diff --git a/runtime/C/src/antlr3filestream.c b/runtime/C/src/antlr3filestream.c
index 4430ffe4a..504e01d38 100644
--- a/runtime/C/src/antlr3filestream.c
+++ b/runtime/C/src/antlr3filestream.c
@@ -232,8 +232,8 @@ setupInputStream(pANTLR3_INPUT_STREAM input)
             }
             else if  (      (ANTLR3_UINT8)(*((pANTLR3_UINT8)input->nextChar))      == 0xFF
                         &&  (ANTLR3_UINT8)(*((pANTLR3_UINT8)input->nextChar+1))    == 0xFE
-                        &&  (ANTLR3_UINT8)(*((pANTLR3_UINT8)input->nextChar+1))    == 0x00
-                        &&  (ANTLR3_UINT8)(*((pANTLR3_UINT8)input->nextChar+1))    == 0x00
+                        &&  (ANTLR3_UINT8)(*((pANTLR3_UINT8)input->nextChar+2))    == 0x00
+                        &&  (ANTLR3_UINT8)(*((pANTLR3_UINT8)input->nextChar+3))    == 0x00
                 )
             {
                 // BOM present, indicates Little Endian
diff --git a/runtime/Cpp/include/antlr3input.inl b/runtime/Cpp/include/antlr3input.inl
index f3362cded..2666a8f27 100755
--- a/runtime/Cpp/include/antlr3input.inl
+++ b/runtime/Cpp/include/antlr3input.inl
@@ -545,8 +545,8 @@ void InputStream<ImplTraits>::setupInputStream()
             }
             else if  (      (ANTLR_UINT8)(*((ANTLR_UINT8*)m_nextChar))      == 0xFF
                         &&  (ANTLR_UINT8)(*((ANTLR_UINT8*)m_nextChar+1))    == 0xFE
-                        &&  (ANTLR_UINT8)(*((ANTLR_UINT8*)m_nextChar+1))    == 0x00
-                        &&  (ANTLR_UINT8)(*((ANTLR_UINT8*)m_nextChar+1))    == 0x00
+                        &&  (ANTLR_UINT8)(*((ANTLR_UINT8*)m_nextChar+2))    == 0x00
+                        &&  (ANTLR_UINT8)(*((ANTLR_UINT8*)m_nextChar+3))    == 0x00
                 )
             {
                 // BOM present, indicates Little Endian