diff --git a/common/main.c b/common/main.c
index 6fec200970..3949a5bb22 100644
--- a/common/main.c
+++ b/common/main.c
@@ -526,7 +526,7 @@ void reset_cmd_timeout(void)
 
 #define CTL_CH(c)		((c) - 'a' + 1)
 
-#define MAX_CMDBUF_SIZE		256
+#define MAX_CMDBUF_SIZE		CONFIG_SYS_CBSIZE
 
 #define CTL_BACKSPACE		('\b')
 #define DEL			((char)255)