diff --git a/opam/opam b/opam/opam
index b4b37a5591cfa2df70110ca4c53eeeb3895f0f60..6d3db50de31befab490b0cc6e95720ab688dfbea 100644
--- a/opam/opam
+++ b/opam/opam
@@ -88,7 +88,7 @@ tags: [
 
 build: [
   ["autoconf"] {dev}
-  ["./configure"]
+  ["./configure" "--prefix" prefix]
   [make "config.sed"]
   ["dune" "build" "-j%{jobs}%" "--release" "@install"]
   [make "-C" "doc" "download"] {with-doc}