diff --git a/src/monger/collection.clj b/src/monger/collection.clj
index 7f9d9d4..c5f215c 100644
--- a/src/monger/collection.clj
+++ b/src/monger/collection.clj
@@ -21,19 +21,19 @@
 (defn ^WriteResult insert
   ([^String collection, ^DBObject document]
      (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)]
-       (.insert coll (to-db-object document) monger.core/*mongodb-write-concern*)))
+       (.insert #^DBCollection coll #^DBObject (to-db-object document) #^WriteConcern monger.core/*mongodb-write-concern*)))
   ([^String collection, ^DBObject document, ^WriteConcern concern]
      (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)]
-       (.insert coll (to-db-object document) concern))))
+       (.insert #^DBCollection coll #^DBObject (to-db-object document) #^WriteConcern concern))))
 
 
 (defn ^WriteResult insert-batch
   ([^String collection, ^List documents]
-     (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)]
-       (.insert coll (to-db-object documents) WriteConcern/NORMAL)))
+     (let [#^DBCollection coll #^DBObject (.getCollection monger.core/*mongodb-database* collection)]
+       (.insert #^DBCollection coll #^DBObject (to-db-object documents) #^WriteConcern WriteConcern/NORMAL)))
   ([^String collection, ^List documents, ^WriteConcern concern]
-     (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)]
-       (.insert coll (to-db-object documents) concern))))
+     (let [#^DBCollection coll #^DBObject (.getCollection monger.core/*mongodb-database* collection)]
+       (.insert #^DBCollection coll #^DBObject (to-db-object documents) #^WriteConcern concern))))
 
 ;; monger.collection/find
 (declare fields-to-db-object)
@@ -44,11 +44,11 @@
        (.find coll)))
   ([^String collection, ^Map ref]
      (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)]
-       (.find coll (to-db-object ref))))
+       (.find #^DBCollection coll #^DBObject (to-db-object ref))))
   ([^String collection, ^Map ref, ^List fields]
      (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)
            map-of-fields (fields-to-db-object fields)]
-       (.find coll (to-db-object ref) (to-db-object map-of-fields))))
+       (.find #^DBCollection coll #^DBObject (to-db-object ref) #^DBObject (to-db-object map-of-fields))))
   )
 
 
@@ -59,7 +59,7 @@
   ([^String collection, ^String id, ^List fields]
      (let [#^DBCollection coll (.getCollection monger.core/*mongodb-database* collection)
            map-of-fields (fields-to-db-object fields)]
-       (.findOne coll (to-db-object { :_id id }) (to-db-object map-of-fields)))))
+       (.findOne #^DBCollection coll #^DBObject (to-db-object { :_id id }) #^DBObject (to-db-object map-of-fields)))))
 
 
 
diff --git a/src/monger/core.clj b/src/monger/core.clj
index d5d784b..a508819 100644
--- a/src/monger/core.clj
+++ b/src/monger/core.clj
@@ -32,7 +32,7 @@
   ([]
      (Mongo.))
   ([{ :keys [host port] :or { host *mongodb-host*, port *mongodb-port* }}]
-     (Mongo. host port)))
+     (Mongo. #^String host #^Long port)))
 
 (defn ^DB get-db
   "Get database reference by name"