diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/threshold/wrap_suppressed_threshold_alerts.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/threshold/wrap_suppressed_threshold_alerts.ts
index a3df4faa14c56..e2fa437a03543 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/threshold/wrap_suppressed_threshold_alerts.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/threshold/wrap_suppressed_threshold_alerts.ts
@@ -6,6 +6,7 @@
  */
 
 import objectHash from 'object-hash';
+import sortBy from 'lodash/sortBy';
 
 import type { SuppressionFieldsLatest } from '@kbn/rule-registry-plugin/common/schemas';
 import {
@@ -79,9 +80,7 @@ export const wrapSuppressedThresholdALerts = ({
       completeRule.ruleParams.ruleId
     );
 
-    const suppressedValues = Object.entries(bucket.key)
-      .map(([key, value]) => value)
-      .sort((a, b) => a.localeCompare(b));
+    const suppressedValues = sortBy(Object.entries(bucket.key).map(([_, value]) => value));
 
     const id = objectHash([
       hit._index,
diff --git a/x-pack/test/functional/es_archives/security_solution/ecs_compliant/mappings.json b/x-pack/test/functional/es_archives/security_solution/ecs_compliant/mappings.json
index 897ac651fcb43..1e2c79a11e26e 100644
--- a/x-pack/test/functional/es_archives/security_solution/ecs_compliant/mappings.json
+++ b/x-pack/test/functional/es_archives/security_solution/ecs_compliant/mappings.json
@@ -66,6 +66,9 @@
           "properties": {
             "name": {
               "type": "keyword"
+            },
+            "uptime": {
+              "type": "long"
             }
           }
         },
diff --git a/x-pack/test/security_solution_api_integration/test_suites/detections_response/default_license/rule_execution_logic/execution_logic/threshold_alert_suppression.ts b/x-pack/test/security_solution_api_integration/test_suites/detections_response/default_license/rule_execution_logic/execution_logic/threshold_alert_suppression.ts
index 59ab5185f6ab6..39b012748930b 100644
--- a/x-pack/test/security_solution_api_integration/test_suites/detections_response/default_license/rule_execution_logic/execution_logic/threshold_alert_suppression.ts
+++ b/x-pack/test/security_solution_api_integration/test_suites/detections_response/default_license/rule_execution_logic/execution_logic/threshold_alert_suppression.ts
@@ -655,6 +655,82 @@ export default ({ getService }: FtrProviderContext) => {
       });
     });
 
+    // should work correctly if one of the suppressed fields is keyword, another - number
+    it('should update an existing alert in the time window with multiple fields of different types', async () => {
+      const id = uuidv4();
+      const timestamp = '2020-10-28T05:45:00.000Z';
+      const firstRunDoc = {
+        id,
+        '@timestamp': timestamp,
+        agent: {
+          name: 'agent-1',
+        },
+        host: {
+          uptime: 100,
+        },
+      };
+
+      const secondRunDoc = {
+        ...firstRunDoc,
+        '@timestamp': '2020-10-28T06:15:00.000Z',
+      };
+
+      await indexListOfDocuments([firstRunDoc, firstRunDoc, secondRunDoc, secondRunDoc]);
+
+      const rule: ThresholdRuleCreateProps = {
+        ...getThresholdRuleForAlertTesting(['ecs_compliant']),
+        query: `id:${id}`,
+        threshold: {
+          field: ['agent.name', 'host.uptime'],
+          value: 2,
+        },
+        alert_suppression: {
+          duration: {
+            value: 2,
+            unit: 'h',
+          },
+        },
+        from: 'now-35m',
+        interval: '30m',
+      };
+
+      const { previewId } = await previewRule({
+        supertest,
+        rule,
+        timeframeEnd: new Date('2020-10-28T06:30:00.000Z'),
+        invocationCount: 2,
+      });
+
+      const previewAlerts = await getPreviewAlerts({
+        es,
+        previewId,
+        sort: ['agent.type', ALERT_ORIGINAL_TIME],
+      });
+
+      expect(previewAlerts.length).toEqual(1);
+
+      expect(previewAlerts[0]._source).toEqual(
+        expect.objectContaining({
+          [ALERT_SUPPRESSION_TERMS]: [
+            {
+              field: 'agent.name',
+              value: 'agent-1',
+            },
+            {
+              field: 'host.uptime',
+              value: 100,
+            },
+          ],
+          [TIMESTAMP]: '2020-10-28T06:00:00.000Z',
+          [ALERT_LAST_DETECTED]: '2020-10-28T06:30:00.000Z',
+          [ALERT_ORIGINAL_TIME]: timestamp,
+          [ALERT_SUPPRESSION_START]: '2020-10-28T06:00:00.000Z',
+          [ALERT_SUPPRESSION_END]: '2020-10-28T06:30:00.000Z',
+          [ALERT_SUPPRESSION_DOCS_COUNT]: 1,
+        })
+      );
+    });
+
     it('should correctly suppress when using a timestamp override', async () => {
       const id = uuidv4();
       const timestamp = '2020-10-28T05:45:00.000Z';