diff --git a/src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java b/src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java
index 217d5f7d45..3144bcddef 100644
--- a/src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java
+++ b/src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java
@@ -517,11 +517,13 @@ private GregorianChange() {
     }
 }
 
-// UTC/GMT time zone singleton. The enum type delays initialization until first use.
-enum UTC {
-    INSTANCE;
+final class UTC {
 
+    // UTC/GMT time zone singleton.
     static final TimeZone timeZone = new SimpleTimeZone(0, "UTC");
+
+    private UTC() {
+    }
 }
 
 final class TDSChannel {