diff --git a/src/odoc.ml b/src/odoc.ml
index 7e4ef035..de90d5ae 100644
--- a/src/odoc.ml
+++ b/src/odoc.ml
@@ -66,7 +66,7 @@ let lib_index sctx ~odoc ~dir ~(lib : Library.t) ~lib_public_name ~doc_dir ~modu
let context = SC.context sctx in
let generated_index_mld = dir ++ sprintf "%s-generated.mld" lib.name in
let source_index_mld = dir ++ sprintf "%s.mld" lib.name in
- let header = {|{%html:%}|} in
+ let header = {|{%html:%}|} in
SC.add_rule sctx
(Build.if_file_exists source_index_mld
~then_:(Build.contents source_index_mld