diff --git a/libs/ardour/ardour/export_status.h b/libs/ardour/ardour/export_status.h
index be4bd25b9d..f207268155 100644
--- a/libs/ardour/ardour/export_status.h
+++ b/libs/ardour/ardour/export_status.h
@@ -22,6 +22,7 @@
 #define __ardour_export_status_h__
 
 #include <list>
+#include <stdint.h>
 
 #include <sigc++/signal.h>
 
diff --git a/libs/ardour/export_file_io.cc b/libs/ardour/export_file_io.cc
index ed60713903..7da6e8a60c 100644
--- a/libs/ardour/export_file_io.cc
+++ b/libs/ardour/export_file_io.cc
@@ -18,6 +18,8 @@
 
 */
 
+#include <string.h>
+
 #include <ardour/export_file_io.h>
 #include <ardour/export_failed.h>
 #include <pbd/failed_constructor.h>
diff --git a/libs/ardour/export_utilities.cc b/libs/ardour/export_utilities.cc
index 5eafbb2d15..64fa62ded5 100644
--- a/libs/ardour/export_utilities.cc
+++ b/libs/ardour/export_utilities.cc
@@ -37,6 +37,8 @@
 
 #include <ardour/export_utilities.h>
 
+#include <string.h>
+
 #include <ardour/export_failed.h>
 #include <ardour/gdither.h>
 #include <ardour/dB.h>