diff --git a/include/LLog.h b/include/LLog.h
index 73d574f..98d3837 100644
--- a/include/LLog.h
+++ b/include/LLog.h
@@ -5,7 +5,9 @@
 #include <stdarg.h>
 #include <stdio.h>
 
+#ifndef max_string_len
 #define max_string_len 1024
+#endif
 
 typedef struct {
     char *buf;