diff --git a/src/java.base/share/classes/sun/security/util/DerValue.java b/src/java.base/share/classes/sun/security/util/DerValue.java
index 0a0cfef4762..3b054ea0a37 100644
--- a/src/java.base/share/classes/sun/security/util/DerValue.java
+++ b/src/java.base/share/classes/sun/security/util/DerValue.java
@@ -1133,7 +1133,8 @@ public class DerValue {
     @Override
     public String toString() {
         return String.format("DerValue(%02x, %s, %d, %d)",
-                0xff & tag, buffer, start, end);
+                0xff & tag, HexFormat.of().withUpperCase().formatHex(buffer),
+                start, end);
     }
 
     /**