diff --git a/doc/rust.texi b/doc/rust.texi
index 005e4b297af..9108986c45b 100644
--- a/doc/rust.texi
+++ b/doc/rust.texi
@@ -5,7 +5,6 @@
 @setchapternewpage odd
 @c %**end of header
 
-@syncodeindex fn cp
 @include version.texi
 
 @ifinfo