diff --git a/tst/regression/test_suites/output_hdf5/output_hdf5.py b/tst/regression/test_suites/output_hdf5/output_hdf5.py
index fcd88fcf4fec..a3b89d059b80 100644
--- a/tst/regression/test_suites/output_hdf5/output_hdf5.py
+++ b/tst/regression/test_suites/output_hdf5/output_hdf5.py
@@ -81,16 +81,7 @@ def Analyse(self,parameters):
         analyze_status = True
         print(os.getcwd())
 
-        # Determine path to parthenon installation
-        # Fallback to relative path on failure
-        try:
-            parthenonPath = os.path.realpath(__file__)
-            idx = parthenonPath.rindex('/parthenon/')
-            parthenonPath = os.path.join(parthenonPath[:idx],'parthenon')
-        except ValueError:
-            baseDir = os.path.dirname(__file__)
-            parthenonPath = baseDir + '/../../../..'
-        sys.path.insert(1, parthenonPath+'/scripts/python')
+        sys.path.insert(1, parameters.parthenon_path + '/scripts/python')
 
         try:
             import phdf_diff 
@@ -101,10 +92,10 @@ def Analyse(self,parameters):
         # TODO(pgrete) make sure this also works/doesn't fail for the user
         ret_2d = phdf_diff.compare([
             'advection_2d.out0.00001.phdf',
-            parthenonPath+'/tst/regression/gold_standard/advection_2d.out0.00001.phdf'])
+            parameters.parthenon_path + '/tst/regression/gold_standard/advection_2d.out0.00001.phdf'])
         ret_3d = phdf_diff.compare([
             'advection_3d.out0.00001.phdf',
-            parthenonPath+'/tst/regression/gold_standard/advection_3d.out0.00001.phdf'])
+            parameters.parthenon_path + '/tst/regression/gold_standard/advection_3d.out0.00001.phdf'])
         
         if ret_2d != 0 or ret_3d != 0:
             analyze_status = False
diff --git a/tst/regression/utils/test_case.py b/tst/regression/utils/test_case.py
index 538dd294bee8..e9817b0c2536 100644
--- a/tst/regression/utils/test_case.py
+++ b/tst/regression/utils/test_case.py
@@ -28,6 +28,7 @@ class Parameters():
     driver_input_path = ""
     test_path = ""
     output_path = ""
+    parthenon_path = ""
     mpi_cmd = ""
     num_ranks = 1
     mpi_opts = ""
@@ -82,6 +83,14 @@ def __init__(self,run_test_path,**kwargs):
         else:
             output_path = os.path.abspath(output_path)
 
+        try:
+            parthenon_path = os.path.realpath(__file__)
+            idx = parthenon_path.rindex('/parthenon/')
+            self.parameters.parthenon_path = os.path.join(parthenon_path[:idx],'parthenon')
+        except ValueError:
+            baseDir = os.path.dirname(__file__)
+            self.parameters.parthenon_path = os.path.abspath(baseDir + '/../../../')
+
         self.__test_module = 'test_suites.' + test_base_name + '.' + test_base_name
 
         test_module = 'test_suites.' + test_base_name + '.' + test_base_name