diff --git a/.test-conda-env-py3.yml b/.test-conda-env-py3.yml
index 601ca64fac3c3b62d4086ccd22e916cb7ec9214b..b7a4c0cdc3d7899428c09fc099d7cb4487d92523 100644
--- a/.test-conda-env-py3.yml
+++ b/.test-conda-env-py3.yml
@@ -8,3 +8,4 @@ dependencies:
 - conda-forge::numpy
 - pocl
 - osx-pocl-opencl
+- mako