diff --git a/app/include/user_config.h b/app/include/user_config.h
index a45daf5c..3e78eadf 100644
--- a/app/include/user_config.h
+++ b/app/include/user_config.h
@@ -23,8 +23,10 @@
 #define COAP_DEBUG
 #define BIT_RATE_DEFAULT BIT_RATE_74880
 #else
-#undef BIT_RATE_DEFAULT
-#define BIT_RATE_DEFAULT BIT_RATE_9600
+# ifndef BIT_RATE_DEFAULT
+# undef BIT_RATE_DEFAULT
+# define BIT_RATE_DEFAULT BIT_RATE_9600
+# endif
 #endif /* DEVELOP_VERSION */