diff --git a/tools/buildtools/protein_structure_rebuilders/BioPDB/BioPDB_align_and_rmsd.py b/tools/buildtools/protein_structure_rebuilders/BioPDB/BioPDB_align_and_rmsd.py
index a88b0749..4b5e2c9b 100644
--- a/tools/buildtools/protein_structure_rebuilders/BioPDB/BioPDB_align_and_rmsd.py
+++ b/tools/buildtools/protein_structure_rebuilders/BioPDB/BioPDB_align_and_rmsd.py
@@ -22,9 +22,10 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-import Bio.PDB
 import argparse
 
+import Bio.PDB
+
 
 def __main__():
     parser = argparse.ArgumentParser(