diff --git a/fuzz/genSeed.c b/fuzz/genSeed.c
index 55c3ab60..ca129504 100644
--- a/fuzz/genSeed.c
+++ b/fuzz/genSeed.c
@@ -77,7 +77,7 @@ fuzzResourceRecorder(void *data ATTRIBUTE_UNUSED, const char *URL,
     }
 
     do {
-        len = xmlParserInputBufferGrow(in->buf, chunkSize);
+        len = xmlParserInputGrow(in, chunkSize);
         if (len < 0) {
             fprintf(stderr, "Error reading %s\n", URL);
             xmlFreeInputStream(in);
diff --git a/include/libxml/parser.h b/include/libxml/parser.h
index b31afc76..55c24344 100644
--- a/include/libxml/parser.h
+++ b/include/libxml/parser.h
@@ -1066,7 +1066,6 @@ XML_DEPRECATED
 XMLPUBFUN int
 		xmlParserInputRead	(xmlParserInputPtr in,
 					 int len);
-XML_DEPRECATED
 XMLPUBFUN int
 		xmlParserInputGrow	(xmlParserInputPtr in,
 					 int len);
diff --git a/include/libxml/xmlIO.h b/include/libxml/xmlIO.h
index 8347e2ed..11d41a33 100644
--- a/include/libxml/xmlIO.h
+++ b/include/libxml/xmlIO.h
@@ -229,12 +229,15 @@ XMLPUBFUN xmlParserInputBufferPtr
 						 xmlInputCloseCallback  ioclose,
 						 void *ioctx,
 	                                         xmlCharEncoding enc);
+XML_DEPRECATED
 XMLPUBFUN int
 	xmlParserInputBufferRead		(xmlParserInputBufferPtr in,
 						 int len);
+XML_DEPRECATED
 XMLPUBFUN int
 	xmlParserInputBufferGrow		(xmlParserInputBufferPtr in,
 						 int len);
+XML_DEPRECATED
 XMLPUBFUN int
 	xmlParserInputBufferPush		(xmlParserInputBufferPtr in,
 						 int len,
diff --git a/python/generator.py b/python/generator.py
index f28a8150..2d6abacf 100755
--- a/python/generator.py
+++ b/python/generator.py
@@ -356,6 +356,9 @@ deprecated_funcs = {
     'xmlParseVersionNum': True,
     'xmlParseXMLDecl': True,
     'xmlParserHandlePEReference': True,
+    'xmlParserInputBufferGrow': True,
+    'xmlParserInputBufferPush': True,
+    'xmlParserInputBufferRead': True,
     'xmlParserSetLineNumbers': True,
     'xmlParserSetLoadSubset': True,
     'xmlParserSetPedantic': True,
diff --git a/xmlIO.c b/xmlIO.c
index a76e1bc0..2787c650 100644
--- a/xmlIO.c
+++ b/xmlIO.c
@@ -1895,7 +1895,9 @@ xmlParserInputBufferCreateStatic(const char *mem, int size,
  * @str:  C string
  * @flags:  flags
  *
- * Create an input buffer for a null-teriminated C string.
+ * DEPRECATED: Use xmlNewInputFromString.
+ *
+ * Create an input buffer for a null-terminated C string.
  *
  * Returns the new input buffer or NULL.
  */
@@ -2067,6 +2069,8 @@ xmlOutputBufferCreateFilenameDefault(xmlOutputBufferCreateFilenameFunc func)
  * @len:  the size in bytes of the array.
  * @buf:  an char array
  *
+ * DEPRECATED: Internal function, don't use.
+ *
  * Push the content of the arry in the input buffer
  * This routine handle the I18N transcoding to internal UTF-8
  * This is used when operating the parser in progressive (push) mode.
@@ -2136,6 +2140,8 @@ endOfInput (void * context ATTRIBUTE_UNUSED,
  * @in:  a buffered parser input
  * @len:  indicative value of the amount of chars to read
  *
+ * DEPRECATED: Internal function, don't use.
+ *
  * Grow up the content of the input buffer, the old data are preserved
  * This routine handle the I18N transcoding to internal UTF-8
  * This routine is used when operating the parser in normal (pull) mode
@@ -2224,9 +2230,9 @@ xmlParserInputBufferGrow(xmlParserInputBufferPtr in, int len) {
  * @in:  a buffered parser input
  * @len:  indicative value of the amount of chars to read
  *
- * Refresh the content of the input buffer, the old data are considered
- * consumed
- * This routine handle the I18N transcoding to internal UTF-8
+ * DEPRECATED: Internal function, don't use.
+ *
+ * Same as xmlParserInputBufferGrow.
  *
  * Returns the number of chars read and stored in the buffer, or -1
  *         in case of error.