diff --git a/jdk/src/share/classes/java/util/IntSummaryStatistics.java b/jdk/src/share/classes/java/util/IntSummaryStatistics.java
index f179e67478b..fcca3296f85 100644
--- a/jdk/src/share/classes/java/util/IntSummaryStatistics.java
+++ b/jdk/src/share/classes/java/util/IntSummaryStatistics.java
@@ -159,7 +159,7 @@ public class IntSummaryStatistics implements IntConsumer {
      */
     public String toString() {
         return String.format(
-            "%s{count=%d, sum=%d, min=%d, average=%d, max=%d}",
+            "%s{count=%d, sum=%d, min=%d, average=%f, max=%d}",
             this.getClass().getSimpleName(),
             getCount(),
             getSum(),
diff --git a/jdk/src/share/classes/java/util/LongSummaryStatistics.java b/jdk/src/share/classes/java/util/LongSummaryStatistics.java
index 3c7b7aee561..0e2da71f8bc 100644
--- a/jdk/src/share/classes/java/util/LongSummaryStatistics.java
+++ b/jdk/src/share/classes/java/util/LongSummaryStatistics.java
@@ -171,7 +171,7 @@ public class LongSummaryStatistics implements LongConsumer, IntConsumer {
      */
     public String toString() {
         return String.format(
-            "%s{count=%d, sum=%d, min=%d, average=%d, max=%d}",
+            "%s{count=%d, sum=%d, min=%d, average=%f, max=%d}",
             this.getClass().getSimpleName(),
             getCount(),
             getSum(),