diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7f4e32c..3bca275 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -31,9 +31,6 @@ jobs:
       - name: POT3D Build and validation with GFortran with optimization (MPI only)
         shell: bash -e -x -l {0}
         run: |
-          cp src/mpi.f90 tests/pot3d/src/
-          cp src/mpi_c_bindings.f90 tests/pot3d/src/
-          cp src/mpi_wrapper.c tests/pot3d/src/
           cd tests/pot3d
           FC="gfortran -O3 -march=native" ./build_and_run_gfortran.sh
 
@@ -41,9 +38,6 @@ jobs:
       - name: POT3D Build and validation with GFortran without optimization (MPI only)
         shell: bash -e -x -l {0}
         run: |
-          cp src/mpi.f90 tests/pot3d/src/
-          cp src/mpi_c_bindings.f90 tests/pot3d/src/
-          cp src/mpi_wrapper.c tests/pot3d/src/
           cd tests/pot3d
           FC="gfortran" ./build_and_run_gfortran.sh
 
@@ -66,9 +60,6 @@ jobs:
       - name: POT3D Build and validation with LFortran with optimization (MPI only)
         shell: bash -e -x -l {0}
         run: |
-          cp src/mpi.f90 tests/pot3d/src/
-          cp src/mpi_c_bindings.f90 tests/pot3d/src/
-          cp src/mpi_wrapper.c tests/pot3d/src/
           cd tests/pot3d
           FC="lfortran --fast" ./build_and_run_lfortran.sh
 
@@ -76,8 +67,5 @@ jobs:
       - name: POT3D Build and validation with GFortran without optimization (MPI only)
         shell: bash -e -x -l {0}
         run: |
-          cp src/mpi.f90 tests/pot3d/src/
-          cp src/mpi_c_bindings.f90 tests/pot3d/src/
-          cp src/mpi_wrapper.c tests/pot3d/src/
           cd tests/pot3d
           FC="lfortran" ./build_and_run_lfortran.sh
diff --git a/tests/pot3d/build_and_run_gfortran.sh b/tests/pot3d/build_and_run_gfortran.sh
index debf6fb..34871f4 100755
--- a/tests/pot3d/build_and_run_gfortran.sh
+++ b/tests/pot3d/build_and_run_gfortran.sh
@@ -7,9 +7,9 @@ else
 fi
 
 cd src
-$CC -I$CONDA_PREFIX/include -c mpi_wrapper.c
-$FC -c mpi_c_bindings.f90
-$FC -c mpi.f90
+$CC -I$CONDA_PREFIX/include -c ../../../src/mpi_wrapper.c
+$FC -c ../../../src/mpi_c_bindings.f90
+$FC -c ../../../src/mpi.f90
 $FC -c psi_io.f90
 $FC -c -cpp pot3d.F90
 $FC mpi_wrapper.o mpi_c_bindings.o mpi.o psi_io.o pot3d.o -o pot3d -L$CONDA_PREFIX/lib -lmpi -Wl,-rpath,$CONDA_PREFIX/lib
diff --git a/tests/pot3d/build_and_run_lfortran.sh b/tests/pot3d/build_and_run_lfortran.sh
index 51b5719..48acaab 100755
--- a/tests/pot3d/build_and_run_lfortran.sh
+++ b/tests/pot3d/build_and_run_lfortran.sh
@@ -7,9 +7,9 @@ else
 fi
 
 cd src
-$CC -I$CONDA_PREFIX/include -c mpi_wrapper.c
-$FC -c mpi_c_bindings.f90
-$FC -c mpi.f90
+$CC -I$CONDA_PREFIX/include -c ../../../src/mpi_wrapper.c
+$FC -c ../../../src/mpi_c_bindings.f90
+$FC -c ../../../src/mpi.f90
 $FC -c psi_io.f90 --no-style-warnings --no-warnings
 $FC -c --cpp --implicit-interface pot3d.F90 --no-style-warnings --no-warnings
 $FC mpi_wrapper.o mpi_c_bindings.o mpi.o psi_io.o pot3d.o -o pot3d -L$CONDA_PREFIX/lib -lmpi -Wl,-rpath,$CONDA_PREFIX/lib