diff --git a/pkg/api/api_bucket_handlers.go b/pkg/api/api_bucket_handlers.go
index 83f24a4fd..9e25a9ba8 100644
--- a/pkg/api/api_bucket_handlers.go
+++ b/pkg/api/api_bucket_handlers.go
@@ -128,7 +128,6 @@ func (server *minioAPI) listBucketsHandler(w http.ResponseWriter, req *http.Requ
 	}
 
 	buckets, err := server.driver.ListBuckets()
-	// cannot fallthrough in (type) switch :(
 	switch err := iodine.ToError(err).(type) {
 	case nil:
 		{
diff --git a/pkg/api/api_object_handlers.go b/pkg/api/api_object_handlers.go
index 621caf8c8..afcad2dcc 100644
--- a/pkg/api/api_object_handlers.go
+++ b/pkg/api/api_object_handlers.go
@@ -345,6 +345,30 @@ func (server *minioAPI) putObjectPartHandler(w http.ResponseWriter, req *http.Re
 	}
 }
 
+func (server *minioAPI) abortMultipartUploadHandler(w http.ResponseWriter, req *http.Request) {
+	acceptsContentType := getContentType(req)
+	if acceptsContentType == unknownContentType {
+		writeErrorResponse(w, req, NotAcceptable, acceptsContentType, req.URL.Path)
+		return
+	}
+	vars := mux.Vars(req)
+	bucket := vars["bucket"]
+	object := vars["object"]
+	uploadID := vars["uploadId"]
+
+	err := server.driver.AbortMultipartUpload(bucket, object, uploadID)
+	switch err := iodine.ToError(err).(type) {
+	case nil:
+		setCommonHeaders(w, getContentTypeString(acceptsContentType))
+		w.WriteHeader(http.StatusNoContent)
+	case drivers.InvalidUploadID:
+		writeErrorResponse(w, req, NoSuchUpload, acceptsContentType, req.URL.Path)
+	default:
+		log.Println(err)
+		writeErrorResponse(w, req, InternalError, acceptsContentType, req.URL.Path)
+	}
+}
+
 func (server *minioAPI) listObjectPartsHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
 	if acceptsContentType == unknownContentType {
diff --git a/pkg/api/api_router.go b/pkg/api/api_router.go
index e7f6a68ca..bc37d182e 100644
--- a/pkg/api/api_router.go
+++ b/pkg/api/api_router.go
@@ -53,6 +53,7 @@ func HTTPHandler(driver drivers.Driver) http.Handler {
 		mux.HandleFunc("/{bucket}/{object:.*}", api.listObjectPartsHandler).Queries("uploadId", "{uploadId:.*}").Methods("GET")
 		mux.HandleFunc("/{bucket}/{object:.*}", api.completeMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}").Methods("POST")
 		mux.HandleFunc("/{bucket}/{object:.*}", api.newMultipartUploadHandler).Methods("POST")
+		mux.HandleFunc("/{bucket}/{object:.*}", api.abortMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}").Methods("DELETE")
 	}
 	mux.HandleFunc("/{bucket}/{object:.*}", api.getObjectHandler).Methods("GET")
 	mux.HandleFunc("/{bucket}/{object:.*}", api.putObjectHandler).Methods("PUT")
diff --git a/pkg/storage/drivers/donut/donut.go b/pkg/storage/drivers/donut/donut.go
index ffe69e690..46796b6f4 100644
--- a/pkg/storage/drivers/donut/donut.go
+++ b/pkg/storage/drivers/donut/donut.go
@@ -415,3 +415,7 @@ func (d donutDriver) CompleteMultipartUpload(bucket, key, uploadID string, parts
 func (d donutDriver) ListObjectParts(bucket, key, uploadID string) (drivers.ObjectResourcesMetadata, error) {
 	return drivers.ObjectResourcesMetadata{}, iodine.New(errors.New("Not Implemented"), nil)
 }
+
+func (d donutDriver) AbortMultipartUpload(bucket, key, uploadID string) error {
+	return iodine.New(errors.New("Not Implemented"), nil)
+}
diff --git a/pkg/storage/drivers/driver.go b/pkg/storage/drivers/driver.go
index 5955456ca..8f8cdad34 100644
--- a/pkg/storage/drivers/driver.go
+++ b/pkg/storage/drivers/driver.go
@@ -41,6 +41,7 @@ type Driver interface {
 
 	// Object Multipart Operations
 	NewMultipartUpload(bucket, key, contentType string) (string, error)
+	AbortMultipartUpload(bucket, key, UploadID string) error
 	CreateObjectPart(bucket, key, uploadID string, partID int, contentType string, md5sum string, size int64, data io.Reader) (string, error)
 	CompleteMultipartUpload(bucket, key, uploadID string, parts map[int]string) (string, error)
 	ListObjectParts(bucket, key, uploadID string) (ObjectResourcesMetadata, error)
diff --git a/pkg/storage/drivers/memory/memory.go b/pkg/storage/drivers/memory/memory.go
index f35972673..7d6ba73f5 100644
--- a/pkg/storage/drivers/memory/memory.go
+++ b/pkg/storage/drivers/memory/memory.go
@@ -555,6 +555,20 @@ func (memory *memoryDriver) NewMultipartUpload(bucket, key, contentType string)
 	return uploadID, nil
 }
 
+func (memory *memoryDriver) AbortMultipartUpload(bucket, key, uploadID string) error {
+	memory.lock.RLock()
+	storedBucket := memory.storedBuckets[bucket]
+	if storedBucket.multiPartSession[key].uploadID != uploadID {
+		memory.lock.RUnlock()
+		return iodine.New(drivers.InvalidUploadID{UploadID: uploadID}, nil)
+	}
+	memory.lock.RUnlock()
+
+	memory.cleanupMultiparts(bucket, key, uploadID)
+	memory.cleanupMultipartSession(bucket, key, uploadID)
+	return nil
+}
+
 func getMultipartKey(key string, uploadID string, partNumber int) string {
 	return key + "?uploadId=" + uploadID + "&partNumber=" + strconv.Itoa(partNumber)
 }
@@ -586,10 +600,10 @@ func (memory *memoryDriver) cleanupMultipartSession(bucket, key, uploadID string
 	delete(memory.storedBuckets[bucket].multiPartSession, key)
 }
 
-func (memory *memoryDriver) cleanupMultiparts(bucket, key, uploadID string, parts map[int]string) {
+func (memory *memoryDriver) cleanupMultiparts(bucket, key, uploadID string) {
 	memory.lock.Lock()
 	defer memory.lock.Unlock()
-	for i := range parts {
+	for i := 1; i <= memory.storedBuckets[bucket].multiPartSession[key].totalParts; i++ {
 		objectKey := bucket + "/" + getMultipartKey(key, uploadID, i)
 		memory.objects.Delete(objectKey)
 	}
@@ -655,11 +669,11 @@ func (memory *memoryDriver) CompleteMultipartUpload(bucket, key, uploadID string
 	md5sum := base64.StdEncoding.EncodeToString(md5sumSlice[:])
 	etag, err := memory.CreateObject(bucket, key, "", md5sum, size, &fullObject)
 	if err != nil {
-		memory.cleanupMultiparts(bucket, key, uploadID, parts)
-		memory.cleanupMultipartSession(bucket, key, uploadID)
+		// No need to call internal cleanup functions here, caller will call AbortMultipartUpload()
+		// which would in-turn cleanup properly in accordance with S3 Spec
 		return "", iodine.New(err, nil)
 	}
-	memory.cleanupMultiparts(bucket, key, uploadID, parts)
+	memory.cleanupMultiparts(bucket, key, uploadID)
 	memory.cleanupMultipartSession(bucket, key, uploadID)
 	return etag, nil
 }
diff --git a/pkg/storage/drivers/mocks/Driver.go b/pkg/storage/drivers/mocks/Driver.go
index 493c18e01..7b278fa8a 100644
--- a/pkg/storage/drivers/mocks/Driver.go
+++ b/pkg/storage/drivers/mocks/Driver.go
@@ -163,3 +163,12 @@ func (m *Driver) ListObjectParts(bucket, key, uploadID string) (drivers.ObjectRe
 
 	return r0, r1
 }
+
+// AbortMultipartUpload is a mock
+func (m *Driver) AbortMultipartUpload(bucket, key, uploadID string) error {
+	ret := m.Called(bucket, key, uploadID)
+
+	r0 := ret.Error(0)
+
+	return r0
+}