diff --git a/components/finsh/shell.h b/components/finsh/shell.h
index 92fa4bccb26247f526b74a08913e7c3c92195187..751590366a0b227d9cda1cf2e2e3b34453f149a5 100644
--- a/components/finsh/shell.h
+++ b/components/finsh/shell.h
@@ -50,7 +50,9 @@
 #ifndef FINSH_THREAD_STACK_SIZE
 #define FINSH_THREAD_STACK_SIZE 2048
 #endif
+#ifndef FINSH_CMD_SIZE
 #define FINSH_CMD_SIZE		80
+#endif
 
 #define FINSH_OPTION_ECHO	0x01
 #if defined(FINSH_USING_MSH) || (defined(RT_USING_DFS) && defined(DFS_USING_WORKDIR))