diff --git a/biobb_gromacs/gromacs/grompp_mdrun.py b/biobb_gromacs/gromacs/grompp_mdrun.py
index 3635d88..57ed65f 100755
--- a/biobb_gromacs/gromacs/grompp_mdrun.py
+++ b/biobb_gromacs/gromacs/grompp_mdrun.py
@@ -3,7 +3,6 @@
 """Module containing the GromppMDrun class and the command line interface."""
 import argparse
 from typing import Optional
-from typing import Optional
 from pathlib import Path
 from biobb_common.generic.biobb_object import BiobbObject
 from biobb_common.configuration import settings
diff --git a/biobb_gromacs/gromacs/mdrun.py b/biobb_gromacs/gromacs/mdrun.py
index a58054b..5895387 100755
--- a/biobb_gromacs/gromacs/mdrun.py
+++ b/biobb_gromacs/gromacs/mdrun.py
@@ -3,7 +3,6 @@
 """Module containing the MDrun class and the command line interface."""
 import argparse
 from typing import Optional
-from typing import Optional
 from biobb_common.generic.biobb_object import BiobbObject
 from biobb_common.configuration import settings
 from biobb_common.tools import file_utils as fu
diff --git a/biobb_gromacs/gromacs/pdb2gmx.py b/biobb_gromacs/gromacs/pdb2gmx.py
index 4c6b6c9..b0a0be8 100755
--- a/biobb_gromacs/gromacs/pdb2gmx.py
+++ b/biobb_gromacs/gromacs/pdb2gmx.py
@@ -4,7 +4,6 @@
 import os
 import argparse
 from typing import Optional
-from typing import Optional
 from biobb_common.generic.biobb_object import BiobbObject
 from biobb_common.configuration import settings
 from biobb_common.tools import file_utils as fu