diff --git a/openjpa-kernel/src/main/java/org/apache/openjpa/kernel/AttachStrategy.java b/openjpa-kernel/src/main/java/org/apache/openjpa/kernel/AttachStrategy.java
index 26a9b0986..74176ad05 100644
--- a/openjpa-kernel/src/main/java/org/apache/openjpa/kernel/AttachStrategy.java
+++ b/openjpa-kernel/src/main/java/org/apache/openjpa/kernel/AttachStrategy.java
@@ -155,6 +155,7 @@ abstract class AttachStrategy
                     set);
                 break;
             case JavaTypes.DATE:
+            case JavaTypes.CALENDAR:
             case JavaTypes.NUMBER:
             case JavaTypes.BOOLEAN_OBJ:
             case JavaTypes.BYTE_OBJ: