diff --git a/HTMLparser.c b/HTMLparser.c
index 22ec576c..e4f816e5 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -6278,7 +6278,8 @@ htmlCreatePushParserCtxt(htmlSAXHandlerPtr sax, void *user_data,
  */
 
 htmlDocPtr
-htmlSAXParseDoc(xmlChar *cur, const char *encoding, htmlSAXHandlerPtr sax, void *userData) {
+htmlSAXParseDoc(const xmlChar *cur, const char *encoding,
+                htmlSAXHandlerPtr sax, void *userData) {
     htmlDocPtr ret;
     htmlParserCtxtPtr ctxt;
 
@@ -6317,7 +6318,7 @@ htmlSAXParseDoc(xmlChar *cur, const char *encoding, htmlSAXHandlerPtr sax, void
  */
 
 htmlDocPtr
-htmlParseDoc(xmlChar *cur, const char *encoding) {
+htmlParseDoc(const xmlChar *cur, const char *encoding) {
     return(htmlSAXParseDoc(cur, encoding, NULL, NULL));
 }
 
diff --git a/include/libxml/HTMLparser.h b/include/libxml/HTMLparser.h
index 551186cb..1d4fec2f 100644
--- a/include/libxml/HTMLparser.h
+++ b/include/libxml/HTMLparser.h
@@ -115,12 +115,12 @@ XMLPUBFUN htmlParserCtxtPtr XMLCALL
 XMLPUBFUN int XMLCALL
 			htmlParseDocument(htmlParserCtxtPtr ctxt);
 XMLPUBFUN htmlDocPtr XMLCALL
-			htmlSAXParseDoc	(xmlChar *cur,
+			htmlSAXParseDoc	(const xmlChar *cur,
 					 const char *encoding,
 					 htmlSAXHandlerPtr sax,
 					 void *userData);
 XMLPUBFUN htmlDocPtr XMLCALL
-			htmlParseDoc	(xmlChar *cur,
+			htmlParseDoc	(const xmlChar *cur,
 					 const char *encoding);
 XMLPUBFUN htmlDocPtr XMLCALL
 			htmlSAXParseFile(const char *filename,