diff --git a/share/tools/web_config/webconfig.py b/share/tools/web_config/webconfig.py
index 16fa92acc..39748bd39 100755
--- a/share/tools/web_config/webconfig.py
+++ b/share/tools/web_config/webconfig.py
@@ -229,7 +229,7 @@ def parse_color(color_str):
     background_color = ""
     underline_color = ""
     bold = False
-    underline = False
+    underline = None
     italics = False
     dim = False
     reverse = False