diff --git a/mcp_can_dfs.h b/mcp_can_dfs.h
index 14c86eb..651480c 100644
--- a/mcp_can_dfs.h
+++ b/mcp_can_dfs.h
@@ -54,7 +54,9 @@
 
 
 // if print debug information
+#ifndef DEBUG_EN
 #define DEBUG_EN        1
+#endif
 
 // Begin mt