diff --git a/packages/conf-oniguruma/conf-oniguruma.1/opam b/packages/conf-oniguruma/conf-oniguruma.1/opam
index ffb75e959df2..420ce33071fe 100644
--- a/packages/conf-oniguruma/conf-oniguruma.1/opam
+++ b/packages/conf-oniguruma/conf-oniguruma.1/opam
@@ -18,7 +18,7 @@ depexts: [
   ["oniguruma"] {os-distribution = "homebrew"}
   ["oniguruma"] {os = "freebsd"}
   ["oniguruma"] {os = "netbsd"}
-  ["oniguruma"] {os = "nixos"}
+  ["oniguruma"] {os-distribution = "nixos"}
 ]
 x-ci-accept-failures: [
   "centos-7"