diff --git a/modelbuilder.py b/modelbuilder.py
index 051a968..3b7c93c 100644
--- a/modelbuilder.py
+++ b/modelbuilder.py
@@ -124,7 +124,7 @@ class LoopModelBuilder:
             self.logger.info(f'No missing residues found in {self.pdb_file}. Skipping model_missing_loops.')
             return mc_dict
         for mc in self.missing_info:
-            out_file = f'5sws_{mc}.pdb'
+            out_file = f'{self.pdb_id}_{mc}.pdb'
             self.analyzer_instance.split_chain(mc).to_pdb(out_file) # get misschain pdb file
             mc_fasta = self.analyzer_instance.filter_sequences(mc) # get misschain fasta file
             if len(mc_fasta) == 1: