diff --git a/norg/borg/borg.nim b/norg/borg/borg.nim
index 9af648c..5acdc60 100644
--- a/norg/borg/borg.nim
+++ b/norg/borg/borg.nim
@@ -11,7 +11,7 @@ const BORG_BIN = "borg"
 
 proc genArchiveName(): string = 
   let hostname = getHostname()
-  let ts = getTime().format("yyyy-MM-dd'T'HH:mm:ssffffff")
+  let ts = getTime().format("yyyy-MM-dd'T'HH:mm:ss'.'ffffff")
   return hostname & "-" & ts
 
 proc genCommand(cmd: string, repo: string, others: seq[string]): string =