diff --git a/CHANGELOG.md b/CHANGELOG.md
index efca497..999f4a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,17 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](https://semver.org/)
 
-## [Unreleased]
-
-### Changed
-
-- default value for "Maximum RAM percentage" parameter changed from 15 to 20
 
 ## [1.0.0alpha2] 2024-06-28
 
 ### Added
 
-- "Annotate inferred axioms" and "Exclude duplicate axioms" parameters in Reason plugin
+- "Annotate inferred axioms" parameter in Reason plugin
 - "Maximum RAM percentage" parameter in Reason and Validate plugins
 
 ### Changed
diff --git a/cmem_plugin_reason/plugin_reason.py b/cmem_plugin_reason/plugin_reason.py
index 0c29cf0..6934de7 100644
--- a/cmem_plugin_reason/plugin_reason.py
+++ b/cmem_plugin_reason/plugin_reason.py
@@ -160,14 +160,6 @@
             description="",
             default_value=False,
         ),
-        PluginParameter(
-            param_type=BoolParameterType(),
-            name="exclude_duplicate_axioms",
-            label="Exclude duplicate axioms",
-            description="Do not add axioms to the output if they exist in an import.",
-            default_value=True,
-            advanced=True,
-        ),
         PluginParameter(
             param_type=BoolParameterType(),
             name="annotate_inferred_axioms",
@@ -202,7 +194,6 @@ def __init__(  # noqa: PLR0913
         sub_class: bool = True,
         sub_data_property: bool = False,
         sub_object_property: bool = False,
-        exclude_duplicate_axioms: bool = True,
         annotate_inferred_axioms: bool = False,
         max_ram_percentage: int = MAX_RAM_PERCENTAGE_DEFAULT,
     ) -> None:
@@ -255,7 +246,6 @@ def __init__(  # noqa: PLR0913
         self.ontology_graph_iri = ontology_graph_iri
         self.result_graph_iri = result_graph_iri
         self.reasoner = reasoner
-        self.exclude_duplicate_axioms = str(exclude_duplicate_axioms).lower()
         self.annotate_inferred_axioms = str(annotate_inferred_axioms).lower()
         self.max_ram_percentage = max_ram_percentage
         self.temp = f"reason_{uuid4().hex}"
@@ -287,7 +277,7 @@ def reason(self, graphs: dict) -> None:
             f'--axiom-generators "{axioms}" '
             f"--annotate-inferred-axioms {self.annotate_inferred_axioms} "
             f"--include-indirect true "
-            f"--exclude-duplicate-axioms {self.exclude_duplicate_axioms} "
+            f"--exclude-duplicate-axioms true "
             f"--exclude-owl-thing true "
             f"--exclude-tautologies all "
             f"--exclude-external-entities "