diff --git a/tests/test_interface_fermi_solver.py b/tests/test_interface_fermi_solver.py
index 83b3debc2..fb78db1d6 100644
--- a/tests/test_interface_fermi_solver.py
+++ b/tests/test_interface_fermi_solver.py
@@ -15,7 +15,7 @@
 
 class FermiSolverTestCase(unittest.TestCase):
     def setUp(self):
-        self.thermo_path = "../examples/CdTe/CdTe_LZ_thermo_wout_meta.json"
+        self.thermo_path = "../examples/CdTe/CdTe_LZ_thermo_wout_meta.json.gz"
         self.bulk_dos_path = "../examples/CdTe/CdTe_prim_k181818_NKRED_2_vasprun.xml.gz"
         self.thermo = loadfn(self.thermo_path)
         self.fs = FermiSolver(self.thermo, self.bulk_dos_path)
@@ -89,7 +89,7 @@ def test_get_interpolated_chempots(self):
 
 class FermiSolverDopedTestCase(unittest.TestCase):
     def setUp(self):
-        self.thermo_path = "../examples/CdTe/CdTe_LZ_thermo_wout_meta.json"
+        self.thermo_path = "../examples/CdTe/CdTe_LZ_thermo_wout_meta.json.gz"
         self.bulk_dos_path = "../examples/CdTe/CdTe_prim_k181818_NKRED_2_vasprun.xml.gz"
         self.thermo = loadfn(self.thermo_path)
         self.fs = FermiSolverDoped(self.thermo, self.bulk_dos_path)
@@ -153,7 +153,7 @@ def test_pseudo_equilibrium_solve(self):
 
 class FermiSolverPyScFermiTestCase(unittest.TestCase):
     def setUp(self):
-        self.thermo_path = "../examples/CdTe/CdTe_LZ_thermo_wout_meta.json"
+        self.thermo_path = "../examples/CdTe/CdTe_LZ_thermo_wout_meta.json.gz"
         self.bulk_dos_path = "../examples/CdTe/CdTe_prim_k181818_NKRED_2_vasprun.xml.gz"
         self.thermo = loadfn(self.thermo_path)
         self.fs = FermiSolverPyScFermi(self.thermo, self.bulk_dos_path, multiplicity_scaling=32)