diff --git a/reframe_tests/reframe_tests.py b/reframe_tests/reframe_tests.py
index 9d9496ec..8df81dd5 100644
--- a/reframe_tests/reframe_tests.py
+++ b/reframe_tests/reframe_tests.py
@@ -264,7 +264,7 @@ class TestBoxGeometryNoPmlMpi(GprMaxMPIRegressionTest):
     mpi_layout = [2, 2, 2]
     serial_dependency = TestBoxGeometryNoPml
     model = serial_dependency.model
-    sourcesdir = serial_dependency.sourcesdir
+    sourcesdir = "src/box_geometry_tests"
 
     @run_before("run")
     def add_gprmax_commands(self):
@@ -277,4 +277,4 @@ class TestBoxGeometryDefaultPmlMpi(GprMaxMPIRegressionTest):
     mpi_layout = [2, 2, 2]
     serial_dependency = TestBoxGeometryDefaultPml
     model = serial_dependency.model
-    sourcesdir = serial_dependency.sourcesdir
+    sourcesdir = "src/box_geometry_tests"
diff --git a/reframe_tests/regression_checks/TestTransmissionLineSource_ced17afa.h5 b/reframe_tests/regression_checks/TestTransmissionLineSource_ced17afa.h5
index 7065641b..f23f8136 100644
Binary files a/reframe_tests/regression_checks/TestTransmissionLineSource_ced17afa.h5 and b/reframe_tests/regression_checks/TestTransmissionLineSource_ced17afa.h5 differ