diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index 4302732fb..6c9efb5ec 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -837,6 +837,9 @@
       <not-bool/>
     </arg>
   </function>
+  <!-- _(string) is often defined as gettext(string) or string somewhere in projects. -->
+  <!-- See https://www.gnu.org/software/gettext//manual/html_node/Mark-Keywords.html -->
+  <define name="_(string)" value="string"/>
   <!-- char * dgettext (const char *domainname, const char *msgid); -->
   <function name="dgettext">
     <noreturn>false</noreturn>