diff --git a/lib/errno.in.h b/lib/errno.in.h
index 4fba101..d33abdb 100644
--- a/lib/errno.in.h
+++ b/lib/errno.in.h
@@ -270,5 +270,10 @@
 #  define GNULIB_defined_ENOTRECOVERABLE 1
 # endif
 
+# ifndef EILSEQ
+#  define EILSEQ ENOENT
+#  define GNULIB_defined_EILSEQ 1
+# endif
+
 #endif /* address@hidden@_ERRNO_H */
 #endif /* address@hidden@_ERRNO_H */