diff --git a/atomate/vasp/workflows/tests/test_adsorbate_workflow.py b/atomate/vasp/workflows/tests/test_adsorbate_workflow.py
index 644c2572a..f9170e5e3 100644
--- a/atomate/vasp/workflows/tests/test_adsorbate_workflow.py
+++ b/atomate/vasp/workflows/tests/test_adsorbate_workflow.py
@@ -16,6 +16,7 @@
     get_slab_trans_params,
     get_wf_slab,
 )
+from phono3py.phonon3.gruneisen import Gruneisen
 
 __author__ = "Kiran Mathew, Joseph Montoya"
 __email__ = "montoyjh@lbl.gov"