diff --git a/doc/src/sgml/extend.sgml b/doc/src/sgml/extend.sgml
index 1c7da4a2abb76c3461a36846fcc83a5627ea5904..2033ae21ba5261f91b48563c0e8ec16fd4db4ff0 100644
--- a/doc/src/sgml/extend.sgml
+++ b/doc/src/sgml/extend.sgml
@@ -322,7 +322,7 @@
        If calling backend functions from C++ code, be sure that the
        C++ call stack contains only plain old data structures
        (<acronym>POD</>).  This is necessary because backend errors
-       generate a distant <function>longjump()</> that does not properly
+       generate a distant <function>longjmp()</> that does not properly
        unroll a C++ call stack with non-POD objects.
       </para>
      </listitem>