diff --git a/src/basic/def.h b/src/basic/def.h
index 4d515c11b6..05e352bc4f 100644
--- a/src/basic/def.h
+++ b/src/basic/def.h
@@ -75,3 +75,5 @@
                 _CONF_PATHS_SPLIT_USR(n))
 
 #define LONG_LINE_MAX (1U*1024U*1024U)
+
+#define HIGH_RLIMIT_NOFILE (256*1024)