diff --git a/man/build_md.py b/man/build_md.py
index 7f6a8e8ba4a..566139f6118 100644
--- a/man/build_md.py
+++ b/man/build_md.py
@@ -383,7 +383,7 @@ def md_files(cls=None, ignore_gui=True):
             and (cls != "*" or len(cmd.split(".")) >= 3)
             and cmd not in ["full_index.md", "index.md"]
             and cmd not in exclude_mods
-            and (ignore_gui and not cmd.startswith("wxGUI.") or not ignore_gui)
+            and ((ignore_gui and not cmd.startswith("wxGUI.")) or not ignore_gui)
         ):
             yield cmd