diff --git a/src/lib/WPXContentListener.cpp b/src/lib/WPXContentListener.cpp
index ab0f9b1..0b559e6 100644
--- a/src/lib/WPXContentListener.cpp
+++ b/src/lib/WPXContentListener.cpp
@@ -23,6 +23,7 @@
  * Corel Corporation or Corel Corporation Limited."
  */
 
+#include <cstddef>
 #include "WPXContentListener.h"
 #include "WPXPageSpan.h"
 #include "libwpd_internal.h"
diff --git a/src/lib/WPXTable.cpp b/src/lib/WPXTable.cpp
index 0ad202a..3ff35e1 100644
--- a/src/lib/WPXTable.cpp
+++ b/src/lib/WPXTable.cpp
@@ -25,6 +25,8 @@
  * Corel Corporation or Corel Corporation Limited."
  */
 
+#include <cstddef>
+
 #include "WPXTable.h"
 
 #include "libwpd_internal.h"