diff --git a/src/pretix/plugins/banktransfer/hbci.py b/src/pretix/plugins/banktransfer/hbci.py
index e0925e863..e4fe6ef28 100644
--- a/src/pretix/plugins/banktransfer/hbci.py
+++ b/src/pretix/plugins/banktransfer/hbci.py
@@ -14,7 +14,7 @@ def hbci_transactions(event, conf):
 
     log = []
     data = []
-    accname = event.id + '_' + str(int(time.time()))
+    accname = 'pretix_%d_%d' % (event.id, int(time.time() * 1000))
     try:
         try:
             subprocess.call([