diff --git a/reg_tests/executeAerodynRegressionCase.py b/reg_tests/executeAerodynRegressionCase.py
index e5b4532415..1462914737 100644
--- a/reg_tests/executeAerodynRegressionCase.py
+++ b/reg_tests/executeAerodynRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeBeamdynRegressionCase.py b/reg_tests/executeBeamdynRegressionCase.py
index 0222aa0bcd..93dbc01f74 100644
--- a/reg_tests/executeBeamdynRegressionCase.py
+++ b/reg_tests/executeBeamdynRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeFASTFarmRegressionCase.py b/reg_tests/executeFASTFarmRegressionCase.py
index 34acdf28cb..273637bb46 100644
--- a/reg_tests/executeFASTFarmRegressionCase.py
+++ b/reg_tests/executeFASTFarmRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.sep.join(sys.argv[0].split(os.path.sep)[:-1]) if os.path.sep in sys.argv[0] else "."
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeHydrodynRegressionCase.py b/reg_tests/executeHydrodynRegressionCase.py
index cc7255f2b1..2c442eb6ba 100644
--- a/reg_tests/executeHydrodynRegressionCase.py
+++ b/reg_tests/executeHydrodynRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeInflowwindPyRegressionCase.py b/reg_tests/executeInflowwindPyRegressionCase.py
index 27fc4aed84..7d88591ba9 100644
--- a/reg_tests/executeInflowwindPyRegressionCase.py
+++ b/reg_tests/executeInflowwindPyRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.sep.join(sys.argv[0].split(os.path.sep)[:-1]) if os.path.sep in sys.argv[0] else "."
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeInflowwindRegressionCase.py b/reg_tests/executeInflowwindRegressionCase.py
index 0956b0bd3b..42c99d6289 100644
--- a/reg_tests/executeInflowwindRegressionCase.py
+++ b/reg_tests/executeInflowwindRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.sep.join(sys.argv[0].split(os.path.sep)[:-1]) if os.path.sep in sys.argv[0] else "."
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeOpenfastAeroAcousticRegressionCase.py b/reg_tests/executeOpenfastAeroAcousticRegressionCase.py
index 37c5f598ec..381879eb25 100644
--- a/reg_tests/executeOpenfastAeroAcousticRegressionCase.py
+++ b/reg_tests/executeOpenfastAeroAcousticRegressionCase.py
@@ -25,7 +25,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeOpenfastCppRegressionCase.py b/reg_tests/executeOpenfastCppRegressionCase.py
index db2ba62ee6..d467d1ac2e 100644
--- a/reg_tests/executeOpenfastCppRegressionCase.py
+++ b/reg_tests/executeOpenfastCppRegressionCase.py
@@ -16,7 +16,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeOpenfastLinearRegressionCase.py b/reg_tests/executeOpenfastLinearRegressionCase.py
index 8d9ed8964f..8e8a9b7015 100644
--- a/reg_tests/executeOpenfastLinearRegressionCase.py
+++ b/reg_tests/executeOpenfastLinearRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeOpenfastRegressionCase.py b/reg_tests/executeOpenfastRegressionCase.py
index a67a77a969..2bb1bb14ca 100644
--- a/reg_tests/executeOpenfastRegressionCase.py
+++ b/reg_tests/executeOpenfastRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/executeSubdynRegressionCase.py b/reg_tests/executeSubdynRegressionCase.py
index 4ca9e63212..94e04a710f 100644
--- a/reg_tests/executeSubdynRegressionCase.py
+++ b/reg_tests/executeSubdynRegressionCase.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import shutil
diff --git a/reg_tests/manualRegressionTest.py b/reg_tests/manualRegressionTest.py
index 551870e8ce..50b9dac8a5 100644
--- a/reg_tests/manualRegressionTest.py
+++ b/reg_tests/manualRegressionTest.py
@@ -24,7 +24,7 @@
 
 import os
 import sys
-basepath = os.path.dirname(__file__)
+basepath = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.sep.join([basepath, "lib"]))
 import argparse
 import subprocess