diff --git a/app/models/services/service_instance.rb b/app/models/services/service_instance.rb
index 612b2e9bac8..6e5355b6a1e 100644
--- a/app/models/services/service_instance.rb
+++ b/app/models/services/service_instance.rb
@@ -24,7 +24,6 @@ class InvalidServiceBinding < StandardError; end
     serialize_attributes :json, :tags
 
     one_to_one :service_instance_operation
-    add_association_dependencies service_instance_operation: :destroy
 
     one_to_many :service_bindings, before_add: :validate_service_binding, key: :service_instance_guid, primary_key: :guid
     one_to_many :service_keys
diff --git a/db/migrations/20220805145100_add_delete_on_cascade_to_fk_svc_inst_op_svc_instance_id.rb b/db/migrations/20220805145100_add_delete_on_cascade_to_fk_svc_inst_op_svc_instance_id.rb
new file mode 100644
index 00000000000..c4409cb0646
--- /dev/null
+++ b/db/migrations/20220805145100_add_delete_on_cascade_to_fk_svc_inst_op_svc_instance_id.rb
@@ -0,0 +1,18 @@
+Sequel.migration do
+  # Add DELETE CASCADE to foreign key fk_svc_inst_op_svc_instance_id to ensure that 'service instance operations'
+  # are deleted together with the referenced 'service instance'.
+
+  up do
+    alter_table :service_instance_operations do
+      drop_constraint :fk_svc_inst_op_svc_instance_id, type: :foreign_key
+      add_foreign_key [:service_instance_id], :service_instances, key: :id, name: :fk_svc_inst_op_svc_instance_id, on_delete: :cascade
+    end
+  end
+
+  down do
+    alter_table :service_instance_operations do
+      drop_constraint :fk_svc_inst_op_svc_instance_id, type: :foreign_key
+      add_foreign_key [:service_instance_id], :service_instances, key: :id, name: :fk_svc_inst_op_svc_instance_id
+    end
+  end
+end
diff --git a/spec/unit/models/services/service_instance_spec.rb b/spec/unit/models/services/service_instance_spec.rb
index 9a4ac055557..96b01a6d2c1 100644
--- a/spec/unit/models/services/service_instance_spec.rb
+++ b/spec/unit/models/services/service_instance_spec.rb
@@ -183,6 +183,16 @@ module VCAP::CloudController
         expect(ServiceInstanceAnnotationModel.where(id: annotation.id)).to be_empty
       end
 
+      it 'cascade deletes the related ServiceInstanceOperation for this instance' do
+        last_operation = ServiceInstanceOperation.make
+        service_instance.service_instance_operation = last_operation
+
+        service_instance.destroy
+
+        expect(ServiceInstance.find(id: service_instance.id)).to be_nil
+        expect(ServiceInstanceOperation.find(id: last_operation.id)).to be_nil
+      end
+
       it 'creates a DELETED service usage event' do
         expect {
           service_instance.destroy