diff --git a/docs/changes.rst b/docs/changes.rst
index 429875e5..d6807569 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -9,6 +9,9 @@ Changelog
   Declare support for Plone 6.
   [ale-rt]
 
+- Remove an unused behavior.
+  [ale-rt]
+
 - Show company certificates in overview
   (`#2142 <https://github.com/syslabcom/scrum/issues/2142>`_)
   [reinhardt]
diff --git a/src/osha/oira/upgrade/v1/20240527102446_remove_unused_behavior/__init__.py b/src/osha/oira/upgrade/v1/20240527102446_remove_unused_behavior/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/src/osha/oira/upgrade/v1/20240527102446_remove_unused_behavior/upgrade.py b/src/osha/oira/upgrade/v1/20240527102446_remove_unused_behavior/upgrade.py
new file mode 100644
index 00000000..e1ea9fea
--- /dev/null
+++ b/src/osha/oira/upgrade/v1/20240527102446_remove_unused_behavior/upgrade.py
@@ -0,0 +1,32 @@
+from ftw.upgrade import UpgradeStep
+from logging import getLogger
+from plone import api
+
+
+logger = getLogger(__name__)
+
+
+class RemoveUnusedBehavior(UpgradeStep):
+    """Remove unused behavior."""
+
+    def __call__(self):
+        """Remove from the euphorie.sector
+        fti the behavior osha.oira.sector.IOSHASector
+        """
+        portal_types = api.portal.get_tool("portal_types")
+        fti = portal_types.get("euphorie.sector")
+        if fti and "osha.oira.sector.IOSHASector" in fti.behaviors:
+            fti.behaviors = tuple(
+                [
+                    behavior
+                    for behavior in fti.behaviors
+                    if behavior != "osha.oira.sector.IOSHASector"
+                ]
+            )
+            logger.info(
+                "Removed behavior osha.oira.sector.IOSHASector from euphorie.sector"
+            )
+        else:
+            logger.info(
+                "Behavior osha.oira.sector.IOSHASector not found in euphorie.sector"
+            )