diff --git a/lib/splitclient-rb/engine/api/splits.rb b/lib/splitclient-rb/engine/api/splits.rb
index b8e08974..1b690e3b 100644
--- a/lib/splitclient-rb/engine/api/splits.rb
+++ b/lib/splitclient-rb/engine/api/splits.rb
@@ -16,6 +16,7 @@ def initialize(api_key, config, telemetry_runtime_producer)
         @spec_version = SplitIoClient::Spec::FeatureFlags::SPEC_VERSION
         @last_proxy_check_timestamp = 0
         @clear_storage = false
+        @old_spec_since = nil
       end
 
       def since(since, since_rbs, fetch_options = { cache_control_headers: false, till: nil, sets: nil})
@@ -24,13 +25,16 @@ def since(since, since_rbs, fetch_options = { cache_control_headers: false, till
         if check_last_proxy_check_timestamp
             @spec_version = SplitIoClient::Spec::FeatureFlags::SPEC_VERSION
             @config.logger.debug("Switching to new Feature flag spec #{@spec_version} and fetching.")
+            @old_spec_since = since
             since = -1
             since_rbs = -1
             fetch_options = { cache_control_headers: false, till: nil, sets: nil}
         end
 
         if @spec_version == Splits::SPEC_1_1
+          since = @old_spec_since unless @old_spec_since.nil?
           params = { s: @spec_version, since: since }
+          @old_spec_since = nil
         else
           params = { s: @spec_version, since: since, rbSince: since_rbs }
         end
diff --git a/spec/engine/api/splits_spec.rb b/spec/engine/api/splits_spec.rb
index 9c384a32..e5c4a47f 100644
--- a/spec/engine/api/splits_spec.rb
+++ b/spec/engine/api/splits_spec.rb
@@ -225,11 +225,38 @@
 
       SplitIoClient::Api::Splits::PROXY_CHECK_INTERVAL_SECONDS = 1
       sleep 1
-      parsed_splits = splits_api.since(-1, -1)
+      parsed_splits = splits_api.since(1457726098069, -1)
       expect(splits_api.clear_storage).to eq(true)
       expect(parsed_splits[:ff][:d].length()).to eq(2)
       expect(parsed_splits[:rbs][:d].length()).to eq(1)
       expect(splits_api.instance_variable_get(:@spec_version)).to eq(SplitIoClient::Spec::FeatureFlags::SPEC_VERSION)
+      expect(splits_api.instance_variable_get(:@old_spec_since)).to eq(1457726098069)
+    end
+
+    it 'check using old_spec_since variable' do
+      old_spec_splits2 = File.read(File.expand_path(File.join(File.dirname(__FILE__), '../../test_data/rule_based_segments/split_old_spec2.json')))
+
+      stub_request(:get, 'https://proxy-server/api/splitChanges?s=1.3&since=-1&rbSince=-1')
+        .to_return({status: 400, body: ''}, {status: 400, body: ''})
+      stub_request(:get, 'https://proxy-server/api/splitChanges?s=1.1&since=-1')
+        .to_return(status: 200, body: old_spec_splits)
+      stub_request(:get, 'https://proxy-server/api/splitChanges?s=1.1&since=1457726098069')
+        .to_return(status: 200, body: old_spec_splits2)
+
+      parsed_splits = splits_api.since(-1, -1)
+      expect(parsed_splits[:ff][:d].length()).to eq(6)
+      expect(splits_api.instance_variable_get(:@spec_version)).to eq(SplitIoClient::Api::Splits::SPEC_1_1)
+
+      SplitIoClient::Api::Splits::PROXY_CHECK_INTERVAL_SECONDS = 1
+      sleep 1
+      parsed_splits = splits_api.since(1457726098069, -1)
+      SplitIoClient::Api::Splits::PROXY_CHECK_INTERVAL_SECONDS = 100000
+
+      sleep 1
+      expect(splits_api.instance_variable_get(:@spec_version)).to eq(SplitIoClient::Api::Splits::SPEC_1_1)
+      expect(splits_api.instance_variable_get(:@old_spec_since)).to eq(nil)
+      expect(parsed_splits[:ff][:d].length()).to eq(1)
+      expect(log.string).to include 'Switching to new Feature flag spec 1.3 and fetching.'
     end
   end
 end
diff --git a/spec/test_data/rule_based_segments/split_old_spec2.json b/spec/test_data/rule_based_segments/split_old_spec2.json
new file mode 100644
index 00000000..74aff1ed
--- /dev/null
+++ b/spec/test_data/rule_based_segments/split_old_spec2.json
@@ -0,0 +1,66 @@
+{
+  "splits": [
+      {
+          "orgId": null,
+          "environment": null,
+          "trafficTypeId": null,
+          "trafficTypeName": null,
+          "name": "new_feature",
+          "seed": -1222652054,
+          "status": "ACTIVE",
+          "killed": false,
+          "changeNumber": 123,
+          "defaultTreatment": "off",
+          "conditions": [
+              {
+                  "matcherGroup": {
+                      "combiner": "AND",
+                      "matchers": [
+                          {
+                              "matcherType": "WHITELIST",
+                              "negate": false,
+                              "userDefinedSegmentMatcherData": null,
+                              "whitelistMatcherData": {
+                                  "whitelist": [
+                                      "whitelisted_user"
+                                  ]
+                              }
+                          }
+                      ]
+                  },
+                  "partitions": [
+                      {
+                          "treatment": "on",
+                          "size": 100
+                      }
+                  ]
+              },
+              {
+                  "matcherGroup": {
+                      "combiner": "AND",
+                      "matchers": [
+                          {
+                              "matcherType": "ALL_KEYS",
+                              "negate": false,
+                              "userDefinedSegmentMatcherData": null,
+                              "whitelistMatcherData": null
+                          }
+                      ]
+                  },
+                  "partitions": [
+                      {
+                          "treatment": "on",
+                          "size": 0
+                      },
+                      {
+                          "treatment": "off",
+                          "size": 100
+                      }
+                  ]
+              }
+          ],
+          "sets": ["set1", "set2"]
+      } ],
+  "since": -1,
+  "till": 1457726098069
+}
\ No newline at end of file