diff --git a/README.md b/README.md
index 82debf2..a2fece6 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ socks5:
   # Socks5 server password
   password: 'password'
   # Socket mark
-  mark: 438
+  mark: 0x438
 
 tcp:
   port: 1088
diff --git a/src/hev-config.c b/src/hev-config.c
index 3c0d483..379b433 100644
--- a/src/hev-config.c
+++ b/src/hev-config.c
@@ -115,7 +115,7 @@ hev_config_parse_server (yaml_document_t *doc, yaml_node_t *base,
     }
 
     if (mark)
-        srv->mark = strtoul (mark, NULL, 16);
+        srv->mark = strtoul (mark, NULL, 0);
 
     return 0;
 }