diff --git a/include/libxml/relaxng.h b/include/libxml/relaxng.h
index e764bad3..079b7f12 100644
--- a/include/libxml/relaxng.h
+++ b/include/libxml/relaxng.h
@@ -13,6 +13,7 @@
 #include <libxml/xmlversion.h>
 #include <libxml/xmlerror.h>
 #include <libxml/xmlstring.h>
+#include <libxml/tree.h>
 
 #ifdef LIBXML_SCHEMAS_ENABLED
 
diff --git a/include/libxml/schemasInternals.h b/include/libxml/schemasInternals.h
index 5806f018..e9d3b3c7 100644
--- a/include/libxml/schemasInternals.h
+++ b/include/libxml/schemasInternals.h
@@ -21,6 +21,7 @@
 #include <libxml/xmlregexp.h>
 #include <libxml/hash.h>
 #include <libxml/dict.h>
+#include <libxml/tree.h>
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/libxml/schematron.h b/include/libxml/schematron.h
index 6e3d837a..8dd8d25c 100644
--- a/include/libxml/schematron.h
+++ b/include/libxml/schematron.h
@@ -15,6 +15,7 @@
 
 #ifdef LIBXML_SCHEMATRON_ENABLED
 
+#include <libxml/xmlerror.h>
 #include <libxml/tree.h>
 
 #ifdef __cplusplus