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diff --git a/moves.h b/moves.h
index b4b9eb3..a86cca5 100644
--- a/moves.h
+++ b/moves.h
@@ -81,6 +81,7 @@ typedef void (*MoveCallback) P((Board board, int flags, ChessMove kind,
 				   destroying your own king is illegal */
 #define F_FRC_TYPE_CASTLING 256 /* generate castlings as captures of own Rook */
 #define F_MANDATORY_CAPTURE 0x200
+#define F_NULL_MOVE         0x400
 
 /* Special epfile values. [HGM] positive values are non-reversible moves! */
 #define EP_NONE (-6)           /* [HGM] Tricky! order matters:            */