diff --git a/cfg/std.cfg b/cfg/std.cfg
index 13eb953fc..493e6ab74 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -8260,4 +8260,8 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
   <define name="SIGKILL" value="9"/>
   <define name="SIGABRT" value="6"/>
   <define name="SIGFPE" value="8"/>
+  <!-- http://www.cplusplus.com/reference/cstdio/fseek/ -->
+  <define name="SEEK_CUR" value="1"/>
+  <define name="SEEK_END" value="2"/>
+  <define name="SEEK_SET" value="0"/>
 </def>