diff --git a/ext/dom/dom_iterators.c b/ext/dom/dom_iterators.c
index 2614eff85a034..21d59c5f02b94 100644
--- a/ext/dom/dom_iterators.c
+++ b/ext/dom/dom_iterators.c
@@ -38,6 +38,7 @@ struct _notationIterator {
 	xmlNotation *notation;
 };
 
+/* Function pointer typedef changed in 2.9.8, see https://github.com/GNOME/libxml2/commit/e03f0a199a67017b2f8052354cf732b2b4cae787 */
 #if LIBXML_VERSION >= 20908
 static void itemHashScanner (void *payload, void *data, const xmlChar *name) /* {{{ */
 #else
diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
index 6b9cd64c299dc..48b981a95a5cf 100644
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -136,7 +136,12 @@ PHP_LIBXML_API void php_libxml_set_old_ns(xmlDocPtr doc, xmlNsPtr ns)
 	php_libxml_set_old_ns_list(doc, ns, ns);
 }
 
+/* Function pointer typedef changed in 2.9.8, see https://github.com/GNOME/libxml2/commit/e03f0a199a67017b2f8052354cf732b2b4cae787 */
+#if LIBXML_VERSION >= 20908
 static void php_libxml_unlink_entity(void *data, void *table, const xmlChar *name)
+#else
+static void php_libxml_unlink_entity(void *data, void *table, xmlChar *name)
+#endif
 {
 	xmlEntityPtr entity = data;
 	if (entity->_private != NULL) {