diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 0ebd0d90f..034d9610a 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -3161,4 +3161,5 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <podtype name="regex_t"/>
   <podtype name="sched_param"/>
   <podtype name="glob_t"/>
+  <define name="MAP_FAILED" value="-1"/>
 </def>