diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index 7e318b4f9..4302732fb 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -57,6 +57,7 @@
   </function>
   <!-- void * xrealloc(void *block, size_t newsize); -->
   <function name="xrealloc">
+    <use-retval/>
     <returnValue type="void *"/>
     <noreturn>false</noreturn>
     <arg nr="1">