diff --git a/pkg/extgrpc/client.go b/pkg/extgrpc/client.go
index 89790d1e19..15ccd03eb6 100644
--- a/pkg/extgrpc/client.go
+++ b/pkg/extgrpc/client.go
@@ -45,7 +45,7 @@ func EndpointGroupGRPCOpts() []grpc.DialOption {
 }
 
 // StoreClientGRPCOpts creates gRPC dial options for connecting to a store client.
-func StoreClientGRPCOpts(logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, secure, skipVerify bool, cert, key, caCert, serverName string) ([]grpc.DialOption, error) {
+func StoreClientGRPCOpts(logger log.Logger, reg prometheus.Registerer, tracer opentracing.Tracer, secure, skipVerify bool, cert, key, caCert, serverName string) ([]grpc.DialOption, error) {
 	grpcMets := grpc_prometheus.NewClientMetrics()
 	grpcMets.EnableClientHandlingTimeHistogram(
 		grpc_prometheus.WithHistogramBuckets([]float64{0.001, 0.01, 0.1, 0.3, 0.6, 1, 3, 6, 9, 20, 30, 60, 90, 120, 240, 360, 720}),
diff --git a/pkg/query/endpointset.go b/pkg/query/endpointset.go
index 8c5d41c820..a8005c571d 100644
--- a/pkg/query/endpointset.go
+++ b/pkg/query/endpointset.go
@@ -307,7 +307,7 @@ type nowFunc func() time.Time
 func NewEndpointSet(
 	now nowFunc,
 	logger log.Logger,
-	reg *prometheus.Registry,
+	reg prometheus.Registerer,
 	endpointSpecs func() []*GRPCEndpointSpec,
 	dialOpts []grpc.DialOption,
 	unhealthyEndpointTimeout time.Duration,