diff --git a/core/src/main/scala/kafka/javaapi/OffsetCommitRequest.scala b/core/src/main/scala/kafka/javaapi/OffsetCommitRequest.scala
index 6de320d..e0b690a 100644
--- a/core/src/main/scala/kafka/javaapi/OffsetCommitRequest.scala
+++ b/core/src/main/scala/kafka/javaapi/OffsetCommitRequest.scala
@@ -28,7 +28,8 @@ class OffsetCommitRequest(groupId: String,
     val scalaMap: collection.mutable.Map[TopicAndPartition, OffsetAndMetadata] = {
       import collection.JavaConversions._
 
-      collection.JavaConversions.asMap(requestInfo)
+      val immutable = requestInfo.toMap
+      collection.mutable.Map(immutable.toSeq:_*)
     }
     kafka.api.OffsetCommitRequest(
       groupId = groupId,