diff --git a/TOOLS/umpv b/TOOLS/umpv
index 67f80e64c6..2044e3e926 100755
--- a/TOOLS/umpv
+++ b/TOOLS/umpv
@@ -50,7 +50,7 @@ def make_abs(filename):
     if not is_url(filename):
         return os.path.abspath(filename)
     return filename
-files = [make_abs(f) for f in files]
+files = (make_abs(f) for f in files)
 
 SOCK = os.path.join(os.getenv("HOME"), ".umpv_socket")