diff --git a/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.test.ts b/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.test.ts
index 1066eb8a987d8..cebf71f1bad97 100644
--- a/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.test.ts
+++ b/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.test.ts
@@ -65,7 +65,7 @@ describe('registerTransactionDurationRuleType', () => {
         'Avg. latency is 5,500 ms in the last 5 mins for opbeans-java. Alert when > 3,000 ms.',
       transactionType: 'request',
       serviceName: 'opbeans-java',
-      threshold: 3000000,
+      threshold: 3000,
       triggerValue: '5,500 ms',
       viewInAppUrl:
         'http://localhost:5601/eyr/app/apm/services/opbeans-java?transactionType=request&environment=ENVIRONMENT_ALL',
diff --git a/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.ts b/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.ts
index 75e1aef357088..803945568494b 100644
--- a/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.ts
+++ b/x-pack/plugins/apm/server/routes/alerts/rule_types/transaction_duration/register_transaction_duration_rule_type.ts
@@ -281,7 +281,7 @@ export function registerTransactionDurationRuleType({
               [TRANSACTION_TYPE]: transactionType,
               [PROCESSOR_EVENT]: ProcessorEvent.transaction,
               [ALERT_EVALUATION_VALUE]: transactionDuration,
-              [ALERT_EVALUATION_THRESHOLD]: thresholdMicroseconds,
+              [ALERT_EVALUATION_THRESHOLD]: ruleParams.threshold,
               [ALERT_REASON]: reason,
               ...sourceFields,
             },
@@ -292,7 +292,7 @@ export function registerTransactionDurationRuleType({
             interval: `${ruleParams.windowSize}${ruleParams.windowUnit}`,
             reason,
             serviceName,
-            threshold: thresholdMicroseconds,
+            threshold: ruleParams.threshold,
             transactionType,
             triggerValue: transactionDurationFormatted,
             viewInAppUrl,