diff --git a/grape6.cpp b/grape6.cpp
index 1a0f2c4..0d86790 100644
--- a/grape6.cpp
+++ b/grape6.cpp
@@ -4,7 +4,7 @@
 #include "yebisu_g6.h"
 #include "g6util.h"
 
-#define NIMAX  2048
+#define NIMAX  1048576
 #define MAXDEV 4
 
 #ifndef NB_FLAG