diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
index 2eef24d2fff..b95800a3c12 100644
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -35,6 +35,7 @@
 #include <libxml/uri.h>
 #include <libxml/xmlerror.h>
 #include <libxml/xmlsave.h>
+#include <libxml/entities.h>
 #ifdef LIBXML_SCHEMAS_ENABLED
 #include <libxml/relaxng.h>
 #include <libxml/xmlschemas.h>