diff --git a/cmd/dwelling-upload-clean/main.go b/cmd/dwelling-upload-clean/main.go
index 8c9751a..ad0f89f 100644
--- a/cmd/dwelling-upload-clean/main.go
+++ b/cmd/dwelling-upload-clean/main.go
@@ -10,8 +10,8 @@ import (
 )
 
 var (
-	uploadDir *string = flag.String("dir", "/srv/upload", "path to a directory where uploaded files are stored")
-	expiry    *int64  = flag.Int64("expiry", 36, "keep files for this much hours")
+	uploadDir *string        = flag.String("dir", "/srv/upload", "path to a directory where uploaded files are stored")
+	expiry    *time.Duration = flag.Duration("expiry", 36*time.Hour, "keep files for this much hours")
 
 	showVersion *bool = flag.Bool("v", false, "show version")
 )
@@ -39,7 +39,7 @@ func main() {
 			continue
 		}
 
-		if time.Now().UTC().Sub(file.ModTime().UTC()) >= time.Duration(*expiry)*time.Hour {
+		if time.Now().UTC().Sub(file.ModTime().UTC()) >= *expiry {
 			if err := os.Remove(path.Join(*uploadDir, entry.Name())); err != nil {
 				log.Printf("failed to remove a file %s: %s", entry.Name(), err)
 			}
diff --git a/init/systemd/dwelling-upload-clean.service b/init/systemd/dwelling-upload-clean.service
index a99cbf6..0da2e53 100755
--- a/init/systemd/dwelling-upload-clean.service
+++ b/init/systemd/dwelling-upload-clean.service
@@ -5,7 +5,7 @@ Description=dwelling-upload-clean
 Type=oneshot
 User=dwupload
 Group=dwupload
-ExecStart=/usr/bin/dwelling-upload-clean -dir /srv/upload -expiry 36
+ExecStart=/usr/bin/dwelling-upload-clean -dir /srv/upload -expiry 36h
 
 ReadOnlyPaths=/
 # Set here path to directory where uploads are stored.