diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index e3309aa..44b15bd 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -1478,7 +1478,7 @@ def local_copy(files):
         log.error(msg)
         return
 
-    args = "df -P ~/facturas | tail -1 | cut -d' ' -f 1"
+    args = 'df -P ~/facturas | tail -1 | cut -d" " -f 1'
     try:
         result = _call(args)
         if result != 'empresalibre\n':