diff --git a/expat/xmlparse/xmlparse.c b/expat/xmlparse/xmlparse.c
index d38dfd1c..90be19c0 100755
--- a/expat/xmlparse/xmlparse.c
+++ b/expat/xmlparse/xmlparse.c
@@ -2023,8 +2023,7 @@ initializeEncoding(XML_Parser parser)
     int i;
     for (i = 0; protocolEncodingName[i]; i++) {
       if (i == sizeof(encodingBuf) - 1
-	  || protocolEncodingName[i] >= 0x80
-	  || protocolEncodingName[i] < 0) {
+	  || (protocolEncodingName[i] & ~0x7f) != 0) {
 	encodingBuf[0] = '\0';
 	break;
       }