diff --git a/src/com/activeandroid/serializer/CalendarSerializer.java b/src/com/activeandroid/serializer/CalendarSerializer.java
index 55509bd08..68958fc62 100644
--- a/src/com/activeandroid/serializer/CalendarSerializer.java
+++ b/src/com/activeandroid/serializer/CalendarSerializer.java
@@ -24,7 +24,7 @@ public Class<?> getDeserializedType() {
 	}
 
 	public Class<?> getSerializedType() {
-		return long.class;
+		return Long.class;
 	}
 
 	public Long serialize(Object data) {
@@ -37,4 +37,4 @@ public Calendar deserialize(Object data) {
 
 		return calendar;
 	}
-}
\ No newline at end of file
+}