diff --git a/app/controllers/v3/service_instances_controller.rb b/app/controllers/v3/service_instances_controller.rb
index e0507407aed..861d0a12931 100644
--- a/app/controllers/v3/service_instances_controller.rb
+++ b/app/controllers/v3/service_instances_controller.rb
@@ -47,7 +47,7 @@ def index
                 ServiceInstanceListFetcher.fetch(
                   message,
                   eager_loaded_associations: Presenters::V3::ServiceInstancePresenter.associated_resources,
-                  readable_space_guids: permission_queryer.readable_space_guids,
+                  readable_spaces_dataset: permission_queryer.readable_space_guids_query,
                 )
               end
 
diff --git a/app/fetchers/service_instance_list_fetcher.rb b/app/fetchers/service_instance_list_fetcher.rb
index d2d81725546..53f167db4d9 100644
--- a/app/fetchers/service_instance_list_fetcher.rb
+++ b/app/fetchers/service_instance_list_fetcher.rb
@@ -4,15 +4,15 @@
 module VCAP::CloudController
   class ServiceInstanceListFetcher < BaseListFetcher
     class << self
-      def fetch(message, omniscient: false, readable_space_guids: [], eager_loaded_associations: [])
+      def fetch(message, omniscient: false, readable_spaces_dataset: nil, eager_loaded_associations: [])
         dataset = ServiceInstance.dataset.eager(eager_loaded_associations).
                   join(:spaces, id: Sequel[:service_instances][:space_id]).
                   left_join(:service_instance_shares, service_instance_guid: Sequel[:service_instances][:guid])
 
         unless omniscient
           dataset = dataset.where do
-            (Sequel[:spaces][:guid] =~ readable_space_guids) |
-              (Sequel[:service_instance_shares][:target_space_guid] =~ readable_space_guids)
+            (Sequel[:spaces][:guid] =~ readable_spaces_dataset) |
+              (Sequel[:service_instance_shares][:target_space_guid] =~ readable_spaces_dataset)
           end
         end
 
diff --git a/spec/unit/fetchers/service_instance_list_fetcher_spec.rb b/spec/unit/fetchers/service_instance_list_fetcher_spec.rb
index c9a516d9a11..80401c6ca2d 100644
--- a/spec/unit/fetchers/service_instance_list_fetcher_spec.rb
+++ b/spec/unit/fetchers/service_instance_list_fetcher_spec.rb
@@ -27,16 +27,16 @@ module VCAP::CloudController
       end
 
       it 'fetches nothing for users who cannot see any spaces' do
-        expect(fetcher.fetch(message).all).to be_empty
+        expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: -1).select(:guid)).all).to be_empty
       end
 
       it 'fetches the instances owned by readable spaces' do
-        dataset = fetcher.fetch(message, readable_space_guids: [space_1.guid, space_3.guid])
+        dataset = fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id, space_3.id]).select(:guid))
         expect(dataset.all).to contain_exactly(msi_1, msi_3, upsi, ssi)
       end
 
       it 'fetches the instances shared to readable spaces' do
-        dataset = fetcher.fetch(message, readable_space_guids: [space_2.guid])
+        dataset = fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_2.id]).select(:guid))
         expect(dataset.all).to contain_exactly(msi_2, ssi)
       end
 
@@ -53,7 +53,7 @@ module VCAP::CloudController
 
           it 'returns instances with matching name' do
             expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(msi_1, ssi)
-            expect(fetcher.fetch(message, readable_space_guids: [space_1.guid])).to contain_exactly(msi_1)
+            expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id]).select(:guid))).to contain_exactly(msi_1)
           end
         end
 
@@ -62,7 +62,7 @@ module VCAP::CloudController
 
           it 'returns instances with matching space guids' do
             expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(msi_1, upsi)
-            expect(fetcher.fetch(message, readable_space_guids: [space_1.guid, space_2.guid])).to contain_exactly(msi_1, upsi)
+            expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id, space_2.id]).select(:guid))).to contain_exactly(msi_1, upsi)
           end
         end
 
@@ -71,7 +71,7 @@ module VCAP::CloudController
 
           it 'returns instances with matching org guids' do
             expect(fetcher.fetch(message, omniscient: true).map(&:guid)).to contain_exactly(*[msi_1, upsi, msi_2, ssi].map(&:guid))
-            expect(fetcher.fetch(message, readable_space_guids: [space_1.guid, space_3.guid])).to contain_exactly(msi_1, ssi, upsi)
+            expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id, space_3.id]).select(:guid))).to contain_exactly(msi_1, ssi, upsi)
           end
         end
 
@@ -83,7 +83,7 @@ module VCAP::CloudController
 
           it 'returns instances with matching labels' do
             expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(msi_2)
-            expect(fetcher.fetch(message, readable_space_guids: [space_1.guid, space_2.guid])).to contain_exactly(msi_2)
+            expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id, space_2.id]).select(:guid))).to contain_exactly(msi_2)
           end
         end
 
@@ -93,7 +93,7 @@ module VCAP::CloudController
 
             it 'returns instances with matching type' do
               expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(msi_1, msi_2, msi_3, ssi)
-              expect(fetcher.fetch(message, readable_space_guids: [space_1.guid])).to contain_exactly(msi_1)
+              expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id]).select(:guid))).to contain_exactly(msi_1)
             end
           end
 
@@ -102,7 +102,7 @@ module VCAP::CloudController
 
             it 'returns instances with matching type' do
               expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(upsi)
-              expect(fetcher.fetch(message, readable_space_guids: [space_1.guid])).to contain_exactly(upsi)
+              expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id]).select(:guid))).to contain_exactly(upsi)
             end
           end
         end
@@ -113,7 +113,7 @@ module VCAP::CloudController
 
           it 'returns instances with matching service plan names' do
             expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(msi_1, msi_2, msi_4)
-            expect(fetcher.fetch(message, readable_space_guids: [space_1.guid])).to contain_exactly(msi_1, msi_4)
+            expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id]).select(:guid))).to contain_exactly(msi_1, msi_4)
           end
         end
 
@@ -123,7 +123,7 @@ module VCAP::CloudController
 
           it 'returns instances with matching service plan guids' do
             expect(fetcher.fetch(message, omniscient: true)).to contain_exactly(msi_1, msi_2, msi_4)
-            expect(fetcher.fetch(message, readable_space_guids: [space_1.guid])).to contain_exactly(msi_1, msi_4)
+            expect(fetcher.fetch(message, readable_spaces_dataset: Space.where(id: [space_1.id]).select(:guid))).to contain_exactly(msi_1, msi_4)
           end
         end
       end