diff --git a/opam b/opam
index 276292fd..033a7efa 100644
--- a/opam
+++ b/opam
@@ -6,7 +6,7 @@ bug-reports: "https://github.com/diml/lambda-term/issues"
 dev-repo: "git://github.com/diml/lambda-term.git"
 license: "BSD3"
 build: [
-  ["./configure" "--prefix" prefix --disable-examples]
+  ["./configure" "--prefix" prefix "--disable-examples"]
   [make]
 ]
 install: [[make "install"]]