diff --git a/.test-conda-env-py3-macos.yml b/.test-conda-env-py3-macos.yml
index 9d36c7805715ea70a0f1573498b6d0768370a9e4..3664a4552b3ae5c6c0f493c9149532dda5e7ed56 100644
--- a/.test-conda-env-py3-macos.yml
+++ b/.test-conda-env-py3-macos.yml
@@ -14,4 +14,6 @@ dependencies:
 - python-symengine=0.3.0
 - pyfmmlib
 - osx-pocl-opencl
+# for OpenMP support in pyfmmlib
+- libgfortran>=3.0.1
 # things not in here: loopy boxtree pymbolic meshmode sumpy