diff --git a/mtda/sdmux/helpers/image.py b/mtda/sdmux/helpers/image.py
index 411120e1..64b79f19 100644
--- a/mtda/sdmux/helpers/image.py
+++ b/mtda/sdmux/helpers/image.py
@@ -266,7 +266,7 @@ def _locate(self, dst):
         self.mtda.debug(3, "sdmux.helpers.image._locate()")
 
         result = None
-        mountpoint = self._mountpoint(self.device)
+        mountpoint = self._mountpoint()
         partitions = psutil.disk_partitions()
         for p in partitions:
             if p.mountpoint.startswith(mountpoint):