diff --git a/pkgs/development/python-modules/linien-common/default.nix b/pkgs/development/python-modules/linien-common/default.nix
index 18b2160d98a6..8220badafc79 100644
--- a/pkgs/development/python-modules/linien-common/default.nix
+++ b/pkgs/development/python-modules/linien-common/default.nix
@@ -31,7 +31,10 @@ buildPythonPackage rec {
 
   build-system = [ setuptools ];
 
-  pythonRelaxDeps = [ "importlib-metadata" ];
+  pythonRelaxDeps = [
+    "importlib-metadata"
+    "numpy"
+  ];
 
   dependencies = [
     importlib-metadata