--- a/src/log.c
+++ b/src/log.c
@@ -244,7 +244,7 @@ void log_print_hex_dump(log_prio_t prio,
     for(i=0; i < len; i++) {
       if(((i+1)*3) >= (MSG_LENGTH_MAX - offset))
         break;
-      snprintf(ptr, 3, "%02X ", buf[i]);
+      snprintf(ptr, 4, "%02X ", buf[i]);
       ptr+=3;
     }
   }
