diff --git a/flake.nix b/flake.nix
index b100b8a99..8851bc3bf 100644
--- a/flake.nix
+++ b/flake.nix
@@ -76,6 +76,9 @@
             openssl pkgconfig sqlite
             libarchive
             boost
+            (if lib.versionAtLeast lib.version "20.03pre"
+             then nlohmann_json
+             else nlohmann_json.override { multipleHeaders = true; })
             nlohmann_json
             rustc cargo