diff --git a/hibernate-core/src/main/java/org/hibernate/dialect/function/DB2SubstringFunction.java b/hibernate-core/src/main/java/org/hibernate/dialect/function/DB2SubstringFunction.java
index fd9c5033aa..787ad14a6c 100644
--- a/hibernate-core/src/main/java/org/hibernate/dialect/function/DB2SubstringFunction.java
+++ b/hibernate-core/src/main/java/org/hibernate/dialect/function/DB2SubstringFunction.java
@@ -30,7 +30,7 @@ import org.hibernate.type.StandardBasicTypes;
  * @author Gail Badner
  */
 public class DB2SubstringFunction extends StandardSQLFunction {
-	private static final Set<String> possibleStringUnits = new HashSet<>(
+	private static final Set<String> possibleStringUnits = new HashSet<String>(
 			Arrays.asList( "CODEUNITS16", "CODEUNITS32", "OCTETS" )
 	);