diff --git a/build/install.sh b/build/install.sh
index 13021a15359f..d092d664a96d 100755
--- a/build/install.sh
+++ b/build/install.sh
@@ -551,6 +551,8 @@ installdir \
   ocamlbuildlib.cmxa \
   ocamlbuildlib.cma \
   ocamlbuild_plugin.cmi \
+  ocamlbuild_plugin.cmo \
+  ocamlbuild_plugin.cmx \
   ocamlbuild_pack.cmi \
   ocamlbuild_unix_plugin.cmi \
   ocamlbuild_unix_plugin.cmo \
diff --git a/build/partial-install.sh b/build/partial-install.sh
index 50a4fe935f82..c06154a8bd60 100755
--- a/build/partial-install.sh
+++ b/build/partial-install.sh
@@ -166,6 +166,8 @@ installdir \
   ocamlbuildlib.cmxa \
   ocamlbuildlib.cma \
   ocamlbuild_plugin.cmi \
+  ocamlbuild_plugin.cmo \
+  ocamlbuild_plugin.cmx \
   ocamlbuild_pack.cmi \
   ocamlbuild_unix_plugin.cmi \
   ocamlbuild_unix_plugin.cmo \