diff --git a/XML/src/HTMLParse.c b/XML/src/HTMLParse.c
index 8d71f9f..7dea289 100644
--- a/XML/src/HTMLParse.c
+++ b/XML/src/HTMLParse.c
@@ -11,6 +11,7 @@
 
 #include "libxml/HTMLparser.h"
 #include "libxml/HTMLtree.h"
+#include "libxml/xmlsave.h"
 
 #include <sys/stat.h>
 #include <unistd.h>  
diff --git a/XML/src/XMLTree.c b/XML/src/XMLTree.c
index 6047de0..c28d5d0 100644
--- a/XML/src/XMLTree.c
+++ b/XML/src/XMLTree.c
@@ -35,6 +35,7 @@
 #include <libxml/HTMLtree.h>
 #endif
 
+#include <libxml/xmlsave.h>
 
 #define R_USE_XML_ENCODING 1
 #include "Utils.h"  /* R_createXMLNodeRef, Encoding macros. */