diff --git a/filters/kword/wordperfect/import/Style.hxx b/filters/kword/wordperfect/import/Style.hxx
index 7d1a138be..808288652 100644
--- a/filters/kword/wordperfect/import/Style.hxx
+++ b/filters/kword/wordperfect/import/Style.hxx
@@ -31,6 +31,8 @@
 #include <libwpd/libwpd.h>
 #include "DocumentElement.hxx"
 
+#include <cstddef>
+
 class TopLevelElementStyle
 {
 public: