diff --git a/.changeset/fluffy-garlics-carry.md b/.changeset/fluffy-garlics-carry.md
new file mode 100644
index 0000000000..69dd58de2e
--- /dev/null
+++ b/.changeset/fluffy-garlics-carry.md
@@ -0,0 +1,5 @@
+---
+"@skeletonlabs/tw-plugin": patch
+---
+
+fix: `properties_dark` for `CustomThemeConfig` is now optional
diff --git a/packages/plugin/src/types.ts b/packages/plugin/src/types.ts
index 6065626bb4..27010dc898 100644
--- a/packages/plugin/src/types.ts
+++ b/packages/plugin/src/types.ts
@@ -74,7 +74,7 @@ export type ThemeConfig = {
 	preset?: Array<PresetThemeConfig | PresetThemeName>;
 };
 
-export type CustomThemeConfig = BaseTheme & {
+export type CustomThemeConfig = {
 	/**
 	 * The name of your custom theme.
 	 *