diff --git a/x-pack/plugins/alerting/server/lib/get_execution_log_aggregation.ts b/x-pack/plugins/alerting/server/lib/get_execution_log_aggregation.ts
index 5b7f87faf41fd..d9894579b50af 100644
--- a/x-pack/plugins/alerting/server/lib/get_execution_log_aggregation.ts
+++ b/x-pack/plugins/alerting/server/lib/get_execution_log_aggregation.ts
@@ -424,7 +424,7 @@ export function getExecutionLogAggregation({
 
 export function getExecutionLogRuntimeMappings(): estypes.MappingRuntimeFields {
   return {
-    'kibana.alerting.outcome': {
+    [OUTCOME_FIELD]: {
       type: 'keyword',
       script: {
         source: `