diff --git a/flake.nix b/flake.nix
index 8b4e73af4..30523c224 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,6 +35,7 @@
             ./CMakeLists.txt
             ./CONTRIBUTING.md
             ./deltachat_derive
+            ./deltachat-contact-tools
             ./deltachat-ffi
             ./deltachat-jsonrpc
             ./deltachat-ratelimit