diff --git a/debian/changelog b/debian/changelog
index d62dd16..2b5bcd3 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ocaml-faad (0.5.1-4) UNRELEASED; urgency=medium
+
+  * Include ocamlvars.mk in debian/rules
+
+ -- Stéphane Glondu <glondu@debian.org>  Thu, 20 Jul 2023 14:55:56 +0200
+
 ocaml-faad (0.5.1-3) unstable; urgency=medium
 
   * Team upload
diff --git a/debian/rules b/debian/rules
index 5f443ee..91ce70b 100755
--- a/debian/rules
+++ b/debian/rules
@@ -1,5 +1,7 @@
 #!/usr/bin/make -f
 # -*- makefile -*-
 
+include /usr/share/ocaml/ocamlvars.mk
+
 %:
 	dh $@ --with ocaml --buildsystem ocaml_dune