diff --git a/x-pack/package.json b/x-pack/package.json
index d6b777f57346c..32a27d878a851 100644
--- a/x-pack/package.json
+++ b/x-pack/package.json
@@ -105,6 +105,7 @@
     "@types/recompose": "^0.30.6",
     "@types/reduce-reducers": "^1.0.0",
     "@types/redux-actions": "^2.6.1",
+    "@types/set-value": "^2.0.0",
     "@types/sinon": "^7.0.13",
     "@types/styled-components": "^4.4.2",
     "@types/supertest": "^2.0.5",
@@ -345,6 +346,7 @@
     "rison-node": "0.3.1",
     "rxjs": "^6.5.3",
     "semver": "5.7.0",
+    "set-value": "^3.0.2",
     "squel": "^5.13.0",
     "stats-lite": "^2.2.0",
     "style-it": "^2.1.3",
diff --git a/x-pack/plugins/siem/server/lib/detection_engine/signals/bulk_create_ml_signals.ts b/x-pack/plugins/siem/server/lib/detection_engine/signals/bulk_create_ml_signals.ts
index d298f1cc7cbc6..a8cc6dc680410 100644
--- a/x-pack/plugins/siem/server/lib/detection_engine/signals/bulk_create_ml_signals.ts
+++ b/x-pack/plugins/siem/server/lib/detection_engine/signals/bulk_create_ml_signals.ts
@@ -4,7 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { flow, set, omit } from 'lodash/fp';
+import { flow, omit } from 'lodash/fp';
+import set from 'set-value';
 import { SearchResponse } from 'elasticsearch';
 
 import { Logger } from '../../../../../../../src/core/server';
@@ -55,8 +56,11 @@ export const transformAnomalyFieldsToEcs = (anomaly: Anomaly): EcsAnomaly => {
   }
 
   const omitDottedFields = omit(errantFields.map(field => field.name));
-  const setNestedFields = errantFields.map(field => set(field.name, field.value));
-  const setTimestamp = set('@timestamp', new Date(timestamp).toISOString());
+  const setNestedFields = errantFields.map(field => (_anomaly: Anomaly) =>
+    set(_anomaly, field.name, field.value)
+  );
+  const setTimestamp = (_anomaly: Anomaly) =>
+    set(_anomaly, '@timestamp', new Date(timestamp).toISOString());
 
   return flow(omitDottedFields, setNestedFields, setTimestamp)(anomaly);
 };
diff --git a/yarn.lock b/yarn.lock
index 892c7a5cefc9f..05cfeddfbfc5f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4744,6 +4744,11 @@
   resolved "https://registry.yarnpkg.com/@types/semver/-/semver-5.5.0.tgz#146c2a29ee7d3bae4bf2fcb274636e264c813c45"
   integrity sha512-41qEJgBH/TWgo5NFSvBCJ1qkoi3Q6ONSF2avrHq1LVEZfYpdHmj0y9SuTK+u9ZhG1sYQKBL1AWXKyLWP4RaUoQ==
 
+"@types/set-value@^2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@types/set-value/-/set-value-2.0.0.tgz#63d386b103926dcf49b50e16e0f6dd49983046be"
+  integrity sha512-k8dCJEC80F/mbsIOZ5Hj3YSzTVVVBwMdtP/M9Rtc2TM4F5etVd+2UG8QUiAUfbXm4fABedL2tBZnrBheY7UwpA==
+
 "@types/shot@*":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@types/shot/-/shot-4.0.0.tgz#7545500c489b65c69b5bc5446ba4fef3bd26af92"
@@ -26770,6 +26775,13 @@ set-value@^2.0.0, set-value@^2.0.1:
     is-plain-object "^2.0.3"
     split-string "^3.0.1"
 
+set-value@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/set-value/-/set-value-3.0.2.tgz#74e8ecd023c33d0f77199d415409a40f21e61b90"
+  integrity sha512-npjkVoz+ank0zjlV9F47Fdbjfj/PfXyVhZvGALWsyIYU/qrMzpi6avjKW3/7KeSU2Df3I46BrN1xOI1+6vW0hA==
+  dependencies:
+    is-plain-object "^2.0.4"
+
 setimmediate@^1.0.4, setimmediate@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/setimmediate/-/setimmediate-1.0.5.tgz#290cbb232e306942d7d7ea9b83732ab7856f8285"