diff --git a/code/ryzom/common/src/game_share/stdpch.h b/code/ryzom/common/src/game_share/stdpch.h
index 736a81afd..88c1ed7f7 100644
--- a/code/ryzom/common/src/game_share/stdpch.h
+++ b/code/ryzom/common/src/game_share/stdpch.h
@@ -21,6 +21,7 @@
 #include <math.h>
 #include <time.h>
 #include <assert.h>
+#include <cstddef>
 
 #include <string>
 #include <vector>