diff --git a/pkgs/development/python-modules/spatialmath/default.nix b/pkgs/development/python-modules/spatialmath/default.nix
index 9d4101a..009fcf0 100644
--- a/pkgs/development/python-modules/spatialmath/default.nix
+++ b/pkgs/development/python-modules/spatialmath/default.nix
@@ -17,6 +17,7 @@
 , sphinx-autodoc-typehints
 , sphinx-rtd-theme
 , sphinxcontrib-jsmath
+, oldest-supported-numpy
 }:
 
 buildPythonPackage rec {
@@ -33,6 +34,7 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [
     setuptools
+    oldest-supported-numpy
   ];
 
   propagatedBuildInputs = [