diff --git a/api/src/main/java/io/grpc/PartialMetricInstrument.java b/api/src/main/java/io/grpc/PartialMetricInstrument.java
index c246b67f81..7e032634f9 100644
--- a/api/src/main/java/io/grpc/PartialMetricInstrument.java
+++ b/api/src/main/java/io/grpc/PartialMetricInstrument.java
@@ -89,4 +89,9 @@ abstract class PartialMetricInstrument implements MetricInstrument {
   public boolean isEnableByDefault() {
     return enableByDefault;
   }
+
+  @Override
+  public String toString() {
+    return getClass().getName() + "(" + getName() + ")";
+  }
 }