diff --git a/actions/ost-compare-structures b/actions/ost-compare-structures
index 6cb962d5278a32a527246c24c59f90814077369c..36baa6c044865c3d1b4d3c1cf067e0b2261eb873 100644
--- a/actions/ost-compare-structures
+++ b/actions/ost-compare-structures
@@ -498,7 +498,7 @@ def _ParseArgs():
     parser.add_argument(
         "--min-pep-length",
         dest="min_pep_length",
-        default = 10,
+        default = 6,
         type=int,
         help=("Relevant parameter if short peptides are involved in scoring."
               "Minimum peptide length for a chain in the target structure to "
diff --git a/modules/mol/alg/pymod/chain_mapping.py b/modules/mol/alg/pymod/chain_mapping.py
index 417cfa58d59b55c1e67be4e3d3b40dd1251f53de..5e90c49dc292c3108524e5c5ce0853f7065dfd18 100644
--- a/modules/mol/alg/pymod/chain_mapping.py
+++ b/modules/mol/alg/pymod/chain_mapping.py
@@ -599,7 +599,7 @@ class ChainMapper:
                  pep_subst_mat = seq.alg.BLOSUM62, pep_gap_open = -11,
                  pep_gap_ext = -1, nuc_subst_mat = seq.alg.NUC44,
                  nuc_gap_open = -4, nuc_gap_ext = -4,
-                 min_pep_length = 10, min_nuc_length = 4,
+                 min_pep_length = 6, min_nuc_length = 4,
                  n_max_naive = 1e8):
 
         # attributes
diff --git a/modules/mol/alg/pymod/scoring.py b/modules/mol/alg/pymod/scoring.py
index e568fdf3afab4577e258ca8bd021e678e9937b33..0f8e3ee560849f6fb60d60c8a07f663e8a8fe822 100644
--- a/modules/mol/alg/pymod/scoring.py
+++ b/modules/mol/alg/pymod/scoring.py
@@ -167,7 +167,7 @@ class Scorer:
                  molck_settings = None, cad_score_exec = None,
                  custom_mapping=None, usalign_exec = None,
                  lddt_no_stereochecks=False, n_max_naive=40320,
-                 oum=False, min_pep_length = 10, min_nuc_length = 4):
+                 oum=False, min_pep_length = 6, min_nuc_length = 4):
 
         self._target_orig = target
         self._model_orig = model