diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index f216b18af..d612a8f68 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -57,7 +57,7 @@
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-null/>
-      <not-uninit/>
+      <minsize type="argvalue" arg="2"/>
     </arg>
     <arg nr="2">
       <not-uninit/>
@@ -70,6 +70,7 @@
     <arg nr="1">
       <not-null/>
       <not-uninit/>
+      <minsize type="argvalue" arg="2"/>
     </arg>
     <arg nr="2">
       <not-uninit/>
@@ -81,6 +82,7 @@
     <arg nr="1">
       <not-null/>
       <not-uninit/>
+      <minsize type="argvalue" arg="2"/>
     </arg>
     <arg nr="2">
       <not-uninit/>