diff --git a/cmd/tusd/cli/composer.go b/cmd/tusd/cli/composer.go
index 356cf8f..ecc87a1 100644
--- a/cmd/tusd/cli/composer.go
+++ b/cmd/tusd/cli/composer.go
@@ -42,13 +42,11 @@ func CreateComposer() {
 		}
 
 		if Flags.S3Endpoint == "" {
-
 			if Flags.S3TransferAcceleration {
 				stdout.Printf("Using 's3://%s' as S3 bucket for storage with AWS S3 Transfer Acceleration enabled.\n", Flags.S3Bucket)
 			} else {
 				stdout.Printf("Using 's3://%s' as S3 bucket for storage.\n", Flags.S3Bucket)
 			}
-
 		} else {
 			stdout.Printf("Using '%s/%s' as S3 endpoint and bucket for storage.\n", Flags.S3Endpoint, Flags.S3Bucket)
 
@@ -61,6 +59,7 @@ func CreateComposer() {
 		store.ObjectPrefix = Flags.S3ObjectPrefix
 		store.PreferredPartSize = Flags.S3PartSize
 		store.DisableContentHashes = Flags.S3DisableContentHashes
+		store.SetConcurrentPartUploads(Flags.S3ConcurrentPartUploads)
 		store.UseIn(Composer)
 
 		locker := memorylocker.New()
diff --git a/pkg/s3store/s3store.go b/pkg/s3store/s3store.go
index da4944c..a44b59a 100644
--- a/pkg/s3store/s3store.go
+++ b/pkg/s3store/s3store.go
@@ -198,8 +198,8 @@ func New(bucket string, service S3API) S3Store {
 	}
 }
 
-// S3ConcurrentPartUploads changes the limit on how many concurrent part uploads to S3 are allowed.
-func (store *S3Store) S3ConcurrentPartUploads(limit int) {
+// SetConcurrentPartUploads changes the limit on how many concurrent part uploads to S3 are allowed.
+func (store *S3Store) SetConcurrentPartUploads(limit int) {
 	store.uploadSemaphore = semaphore.New(limit)
 }