diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index c9b2dbf50..a3f8a9863 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -519,6 +519,7 @@
     <noreturn>false</noreturn>
     <leak-ignore/>
     <use-retval/>
+    <returnValue type="void *"/>
     <arg nr="1">
       <not-null/>
       <not-uninit/>
@@ -541,6 +542,7 @@
   <function name="memrchr">
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <returnValue type="void *"/>
     <arg nr="1">
       <not-null/>
       <not-uninit/>
@@ -560,6 +562,7 @@
   <function name="rawmemchr">
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <returnValue type="void *"/>
     <arg nr="1">
       <not-null/>
       <not-uninit/>