diff --git a/wetb/utils/process_exec.py b/wetb/utils/process_exec.py
index adde55007c7881e918c7921d0c3d34d00a7335da..b1bcef7e807f85f2bc4af1d2252e8c04d7826009 100644
--- a/wetb/utils/process_exec.py
+++ b/wetb/utils/process_exec.py
@@ -74,7 +74,7 @@ def unix_filename(filename):
     Filename
 
     """
-    filename = os.path.realpath(filename).replace("\\", "/")
+    filename = os.path.realpath(filename.replace("\\", "/")).replace("\\", "/")
     ufn, rest = os.path.splitdrive(filename)
     ufn += "/"
     for f in rest[1:].split("/"):