diff --git a/lib/marc_access_facet_processor.rb b/lib/marc_access_facet_processor.rb
index 8d0d3d98..1b3619a3 100644
--- a/lib/marc_access_facet_processor.rb
+++ b/lib/marc_access_facet_processor.rb
@@ -26,7 +26,8 @@ def extract_access_data(record, context)
     end
 
     access << 'Online' if context.output_hash&.dig('ht_id_ssim')
-    access.compact.uniq
+    access.compact!
+    access.uniq!
     access.delete 'On Order' if not_only_on_order? access
     access
   end
diff --git a/spec/fixtures/access_uniq.mrc b/spec/fixtures/access_uniq.mrc
new file mode 100644
index 00000000..270f9605
--- /dev/null
+++ b/spec/fixtures/access_uniq.mrc
@@ -0,0 +1 @@
+008986789   00097       0010005000009490127000059490127001329490225002599490225004849490091007091234  aElectronic resourcewASISc1i4059691-2001lONLINEmONLINErYsYtONLINEu10/19/2007o.STAFF. 20071003 EEBO#2 STC1-59dedup  aElectronic resourcewASISc1i4059691-2001lONLINEmONLINErYsYtONLINEu10/19/2007o.STAFF. 20071003 EEBO#2 STC1-59dedup  aMicrofilm D18 reel.907:1wASISc1i000079527897d10/2/2009e7/22/2009lCATO-2mUP-ANNEXn1q1rYsYtMICROFORMu10/19/2007z8043o.STAFF. Upon return, route to cataloging. 7/21/09 smo.STAFF. 20071003 EEBO#2 STC1-59dedup  aMicrofilm D18 reel.907:1wASISc1i000079527897d10/2/2009e7/22/2009lCATO-2mUP-ANNEXn1q1rYsYtMICROFORMu10/19/2007z8043o.STAFF. Upon return, route to cataloging. 7/21/09 smo.STAFF. 20071003 EEBO#2 STC1-59dedup  aAQ14656449wLCc1i000080938682lON-ORDERmUP-PATrYsYtBOOKu1/10/2019o.STAFF. GOBI
\ No newline at end of file
diff --git a/spec/lib/traject/access_facet_spec.rb b/spec/lib/traject/access_facet_spec.rb
index fad3609e..2a1da548 100644
--- a/spec/lib/traject/access_facet_spec.rb
+++ b/spec/lib/traject/access_facet_spec.rb
@@ -32,6 +32,11 @@
       expect(result['access_facet']).to contain_exactly 'In the Library', 'Online'
     end
 
+    it 'produces a uniq set of access facet values' do
+      result = @indexer.map_record(MARC::Reader.new(File.join(fixture_path, 'access_uniq.mrc')).to_a.first)
+      expect(result['access_facet']).to contain_exactly 'Online', 'In the Library'
+    end
+
     it 'produces Other when a record has a 949m library code that is not listed' do
       result = @indexer.map_record(MARC::Reader.new(File.join(fixture_path, 'access_other.mrc')).to_a.first)
       expect(result['access_facet']).to contain_exactly 'Other'