diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3544b2e9..248ec39d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@
   * `CortexIngesterReachingTenantsLimit`
 * [ENHANCEMENT] Improved `CortexRulerFailedRingCheck` to avoid firing in case of very short errors. #297
 * [BUGFIX] Fixed `CortexCompactorRunFailed` false positives. #288
+* [BUGFIX] Add missing components (admin-api, compactor, store-gateway) to `CortexGossipMembersMismatch`. #305
 
 ## 1.8.0 / 2021-03-25
 
diff --git a/cortex-mixin/alerts/alerts.libsonnet b/cortex-mixin/alerts/alerts.libsonnet
index 7568b4fd..38c9d00e 100644
--- a/cortex-mixin/alerts/alerts.libsonnet
+++ b/cortex-mixin/alerts/alerts.libsonnet
@@ -583,7 +583,7 @@
           expr: |||
             memberlist_client_cluster_members_count
               != on (%s) group_left
-            sum by (%s) (up{job=~".+/(distributor|ingester.*|querier|cortex|ruler)"})
+            sum by (%s) (up{job=~".+/(admin-api|compactor|store-gateway|distributor|ingester.*|querier|cortex|ruler)"})
           ||| % [$._config.alert_aggregation_labels, $._config.alert_aggregation_labels],
           'for': '5m',
           labels: {