diff --git a/querydsl-mongodb/src/main/java/com/querydsl/mongodb/MongodbSerializer.java b/querydsl-mongodb/src/main/java/com/querydsl/mongodb/MongodbSerializer.java
index 8075d4652..09a84acf1 100644
--- a/querydsl-mongodb/src/main/java/com/querydsl/mongodb/MongodbSerializer.java
+++ b/querydsl-mongodb/src/main/java/com/querydsl/mongodb/MongodbSerializer.java
@@ -127,6 +127,11 @@ public abstract class MongodbSerializer implements Visitor<Object, Void> {
             if (subOp == Ops.IN) {
                 return visit(OperationImpl.create(Boolean.class, Ops.NOT_IN, subOperation.getArg(0),
                         subOperation.getArg(1)), context);
+            } else if (subOp == Ops.COL_IS_EMPTY) {
+                DBObject visit = (DBObject)visit(OperationImpl.create(Boolean.class, Ops.COL_IS_EMPTY, subOperation.getArg(0)), context);
+                Object existingOperator = visit.removeField("$or");
+                visit.put("$nor", existingOperator);
+                return visit;
             } else if (subOp != Ops.EQ && subOp != Ops.STRING_IS_EMPTY) {
                 return asDBObject(key, asDBObject("$not", arg.get(key)));
             } else {
@@ -309,4 +314,4 @@ public abstract class MongodbSerializer implements Visitor<Object, Void> {
         throw new UnsupportedOperationException();
     }
 
-}
\ No newline at end of file
+}
diff --git a/querydsl-mongodb/src/test/java/com/querydsl/mongodb/MongodbSerializerTest.java b/querydsl-mongodb/src/test/java/com/querydsl/mongodb/MongodbSerializerTest.java
index 194795a41..6aa606f0e 100644
--- a/querydsl-mongodb/src/test/java/com/querydsl/mongodb/MongodbSerializerTest.java
+++ b/querydsl-mongodb/src/test/java/com/querydsl/mongodb/MongodbSerializerTest.java
@@ -97,6 +97,26 @@ public class MongodbSerializerTest {
         assertQuery(user.addresses.any().street.eq("Aakatu"), dbo("addresses.street","Aakatu"));
     }
 
+    @Test
+    public void CollectionIsEmpty() {
+        BasicDBObject expected = dbo("$or",
+            dblist(
+                dbo("addresses", dblist()),
+                dbo("addresses",
+                    dbo("$exists", false))));
+        assertQuery(QUser.user.addresses.isEmpty(), expected);
+    }
+
+    @Test
+    public void CollectionIsNotEmpty() {
+        BasicDBObject expected = dbo("$nor",
+            dblist(
+                dbo("addresses", dblist()),
+                dbo("addresses",
+                    dbo("$exists", false))));
+        assertQuery(QUser.user.addresses.isNotEmpty(), expected);
+    }
+
     @Test
     public void Equals() {
         assertQuery(title.eq("A"), dbo("title","A"));
@@ -131,7 +151,6 @@ public class MongodbSerializerTest {
 
     @Test
     public void Between() {
-        System.err.println(dbo("year", dbo("$gte", 1).append("$lte", 10)));
         assertQuery(year.between(1, 10), dbo("year", dbo("$gte", 1).append("$lte", 10)));
     }
 
@@ -161,6 +180,12 @@ public class MongodbSerializerTest {
         assertQuery(year.in(1,2,3), dbo("year", dbo("$in", 1,2,3)));
     }
 
+    @Test
+    public void NotIn() {
+        assertQuery(year.in(1,2,3).not(), dbo("year", dbo("$nin", 1,2,3)));
+        assertQuery(year.notIn(1,2,3), dbo("year", dbo("$nin", 1,2,3)));
+    }
+
     @Test
     public void OrderBy() {
         DBObject orderBy = serializer.toSort(sortList(year.asc()));
@@ -242,7 +267,6 @@ public class MongodbSerializerTest {
         }
         return new BasicDBObject(key, value);
     }
-
     public static BasicDBList dblist(Object... contents) {
         BasicDBList list = new BasicDBList();
         list.addAll(Arrays.asList(contents));