diff --git a/xds/src/main/java/io/grpc/xds/sds/trust/CertificateUtils.java b/xds/src/main/java/io/grpc/xds/sds/trust/CertificateUtils.java
index <HASH>..<HASH> 100644
--- a/xds/src/main/java/io/grpc/xds/sds/trust/CertificateUtils.java
+++ b/xds/src/main/java/io/grpc/xds/sds/trust/CertificateUtils.java
@@ -50,4 +50,6 @@ final class CertificateUtils {
       bis.close();
     }
   }
+
+  private CertificateUtils() {}
 }
xds: add private constructor for utility class. (#<I>)