diff --git a/gns3/settings.py b/gns3/settings.py
index f90427e2..adc24d73 100644
--- a/gns3/settings.py
+++ b/gns3/settings.py
@@ -180,7 +180,7 @@ if sys.platform.startswith("win"):
     # Windows
     PRECONFIGURED_VNC_CONSOLE_COMMANDS = {
         'TightVNC (included with GNS3)': 'tvnviewer.exe {host}:{port}',
-        'UltraVNC': r'"{}\uvnc bvba\UltraVNC\vncviewer.exe" {{host}}:{{port}}'.format(program_files)
+        'UltraVNC': r'"{}\uvnc bvba\UltraVNC\vncviewer.exe" {{host}}:{{port}}'.format(program_files),
         'SuperPutty': r'SuperPutty.exe -vnc {host}::{port}',
     }