diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts
index cdd3e667df71f..b87889106e8e9 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts
@@ -194,13 +194,16 @@ describe('rules_notification_alert_type', () => {
           'myfa*': {
             read: true,
           },
+          'anotherindex*': {
+            read: true,
+          },
           'some*': {
             read: false,
           },
         },
         application: {},
       });
-      payload.params.index = ['some*', 'myfa*'];
+      payload.params.index = ['some*', 'myfa*', 'anotherindex*'];
       await alert.executor(payload);
       expect(ruleStatusService.partialFailure).toHaveBeenCalled();
       expect(ruleStatusService.partialFailure.mock.calls[0][0]).toContain(
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.ts
index 60be3b04881c9..dd658c232ace1 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.ts
@@ -179,10 +179,7 @@ export const signalRulesAlertType = ({
           (indexName) => privileges.index[indexName].read
         );
 
-        if (
-          indexesWithReadPrivileges.length > 0 &&
-          indexesWithNoReadPrivileges.length >= indexesWithReadPrivileges.length
-        ) {
+        if (indexesWithReadPrivileges.length > 0 && indexesWithNoReadPrivileges.length > 0) {
           // some indices have read privileges others do not.
           // set a partial failure status
           const errorString = `Missing required read permissions on indexes: ${JSON.stringify(