diff --git a/qltool b/qltool
index 1956fd657..9a63841a2 100755
--- a/qltool
+++ b/qltool
@@ -267,7 +267,7 @@ def run():
         'profile':     options.profile,
         'console':     options.console,
         'filter':      options.filter,
-        'log_devices': options.log_file or [options.log_file],
+        'log_devices': options.log_file and [options.log_file],
         'log_plain':   options.log_plain,
         'multithread': options.multithread,
         'libcache':    options.libcache