diff --git a/docs/changelog.rst b/docs/changelog.rst
index bd3f1c8a3..66af34f7f 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -122,6 +122,8 @@ Detailed list of changes
 
 - ssh kitten: Fix incorrect copying of data files when using the python interpreter and also fix incorrect hard link detection (:disc:`8308`)
 
+- Fix a regression in the previous release that broke setting of nullable colors
+
 0.39.1 [2025-02-01]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/gen/config.py b/gen/config.py
index f6ad9760a..a0c5cb1f3 100755
--- a/gen/config.py
+++ b/gen/config.py
@@ -52,7 +52,7 @@ def main(args: list[str]=sys.argv) -> None:
                 all_colors.append(opt.name)
     patch_color_list('tools/cmd/at/set_colors.go', nullable_colors, 'NULLABLE')
     patch_color_list('tools/themes/collection.go', all_colors, 'ALL')
-    nc = '\n    '.join(f'{x!r}' for x in nullable_colors)
+    nc = '\n,    '.join(f'{x!r}' for x in nullable_colors)
     write_output('kitty', definition, f'\nnullable_colors = frozenset({{\n    {nc}\n}})\n')
 
 
diff --git a/kitty/options/types.py b/kitty/options/types.py
index e599e5d80..444edee33 100644
--- a/kitty/options/types.py
+++ b/kitty/options/types.py
@@ -1045,15 +1045,15 @@ defaults.mouse_map = [
 
 
 nullable_colors = frozenset({
-    'cursor'
-    'cursor_text_color'
-    'visual_bell_color'
-    'active_border_color'
-    'tab_bar_background'
-    'tab_bar_margin_color'
-    'selection_foreground'
+    'cursor',
+    'cursor_text_color',
+    'visual_bell_color',
+    'active_border_color',
+    'tab_bar_background',
+    'tab_bar_margin_color',
+    'selection_foreground',
     'selection_background'
 })
 
 
-secret_options = ('remote_control_password', 'file_transfer_confirmation_bypass')
\ No newline at end of file
+secret_options = ('remote_control_password', 'file_transfer_confirmation_bypass')