1 files changed, 3 insertions, 2 deletions
diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/DoubleGaugeImpl.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/DoubleGaugeImpl.java
index 86b3512d..c314e980 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/metrics/DoubleGaugeImpl.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/DoubleGaugeImpl.java
@@ -44,7 +44,8 @@ public final class DoubleGaugeImpl extends DoubleGauge implements Meter {
   @VisibleForTesting static final LabelValue UNSET_VALUE = LabelValue.create(null);
 
   private final MetricDescriptor metricDescriptor;
-  private volatile Map<List<LabelValue>, PointImpl> registeredPoints = Collections.emptyMap();
+  private volatile Map<List<LabelValue>, PointImpl> registeredPoints =
+      Collections.<List<LabelValue>, PointImpl>emptyMap();
   private final int labelKeysSize;
   private final List<LabelValue> defaultLabelValues;
 
@@ -99,7 +100,7 @@ public final class DoubleGaugeImpl extends DoubleGauge implements Meter {
 
   @Override
   public synchronized void clear() {
-    registeredPoints = Collections.emptyMap();
+    registeredPoints = Collections.<List<LabelValue>, PointImpl>emptyMap();
   }
 
   private synchronized DoublePoint registerTimeSeries(List<LabelValue> labelValues) {