diff --git a/internal/provisioner/utility/prometheus_operator.go b/internal/provisioner/utility/prometheus_operator.go
index 9e773f689..8680f1fc7 100644
--- a/internal/provisioner/utility/prometheus_operator.go
+++ b/internal/provisioner/utility/prometheus_operator.go
@@ -97,7 +97,8 @@ func (p *prometheusOperator) CreateOrUpgrade() error {
 			Name: "thanos-objstore-config",
 		},
 		StringData: map[string]string{
-			"thanos.yaml": string(secret),
+			"thanos.yaml":  string(secret),
+			"objstore.yml": string(secret),
 		},
 	}
 
diff --git a/internal/provisioner/utility/unmanaged.go b/internal/provisioner/utility/unmanaged.go
index a10ca2e70..01eeeb65b 100644
--- a/internal/provisioner/utility/unmanaged.go
+++ b/internal/provisioner/utility/unmanaged.go
@@ -122,7 +122,8 @@ func (u *unmanaged) CreateOrUpgrade() error {
 				Name: "thanos-objstore-config",
 			},
 			StringData: map[string]string{
-				"thanos.yaml": string(secret),
+				"thanos.yaml":  string(secret),
+				"objstore.yml": string(secret),
 			},
 		}