diff --git a/amp_wrapper.h b/amp_wrapper.h
index d3c34e8..72b2c41 100644
--- a/amp_wrapper.h
+++ b/amp_wrapper.h
@@ -19,7 +19,7 @@
 #define AREN_OUTPUT_PORT_NUM   1
 #define AREN_OUTPUT_PORT_NUM_PASS 3
 
-#define MAX_BUF_NUM      (347)
+#define MAX_BUF_NUM      (30)
 #define MAX_BUF_SIZE     (188 * 128)
 #define WRAP_UP(a, b)    (((a) + (b) - 1) / (b) * (b))
 #define BUF_ACTURAL_SIZE (MAX_BUF_SIZE * MAX_BUF_NUM)