diff --git a/README.md b/README.md
index 9c21c482..6ce08432 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ Metrics gathered from Google Stackdriver Monitoring are converted to Prometheus
   3. the metric type labels (see [Metrics List][metrics-list])
   4. the monitored resource labels (see [Monitored Resource Types][monitored-resources])
 * For each timeseries, only the most recent data point is exported.
-* Stackdriver `GAUGE` metric kinds are reported as Prometheus `Gauge` metrics; Stackdriver `DELTA` and `CUMULATIVE` metric kinds are reported as Prometheus `Counter` metrics.
+* Stackdriver `GAUGE` and `DELTA` metric kinds are reported as Prometheus `Gauge` metrics; Stackdriver `CUMULATIVE` metric kinds are reported as Prometheus `Counter` metrics.
 * Only `BOOL`, `INT64`, `DOUBLE` and `DISTRIBUTION` metric types are supported, other types (`STRING` and `MONEY`) are discarded.
 * `DISTRIBUTION` metric type is reported as a Prometheus `Histogram`, except the `_sum` time series is not supported.
 
diff --git a/collectors/monitoring_collector.go b/collectors/monitoring_collector.go
index 22178f1e..f56dd95a 100644
--- a/collectors/monitoring_collector.go
+++ b/collectors/monitoring_collector.go
@@ -278,7 +278,7 @@ func (c *MonitoringCollector) reportTimeSeriesMetrics(
 		case "GAUGE":
 			metricValueType = prometheus.GaugeValue
 		case "DELTA":
-			metricValueType = prometheus.CounterValue
+			metricValueType = prometheus.GaugeValue
 		case "CUMULATIVE":
 			metricValueType = prometheus.CounterValue
 		default: