diff --git a/.changeset/serious-icons-invent.md b/.changeset/serious-icons-invent.md
new file mode 100644
index 000000000..5325a34d7
--- /dev/null
+++ b/.changeset/serious-icons-invent.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/markdown-support': patch
+---
+
+Fix the importing of `unified` `Plugin` and `UnifiedPlugin` types
diff --git a/packages/markdown-support/src/load-plugins.ts b/packages/markdown-support/src/load-plugins.ts
index 5b24f14f6..6d30e8361 100644
--- a/packages/markdown-support/src/load-plugins.ts
+++ b/packages/markdown-support/src/load-plugins.ts
@@ -1,4 +1,4 @@
-import unified from 'unified';
+import * as unified from 'unified';
 import type { Plugin, UnifiedPluginImport } from './types';
 
 async function importPlugin(p: string | UnifiedPluginImport): UnifiedPluginImport {
diff --git a/packages/markdown-support/src/types.ts b/packages/markdown-support/src/types.ts
index e263bcd4d..be73db6a5 100644
--- a/packages/markdown-support/src/types.ts
+++ b/packages/markdown-support/src/types.ts
@@ -1,4 +1,4 @@
-import unified from 'unified';
+import * as unified from 'unified';
 
 export type UnifiedPluginImport = Promise<{ default: unified.Plugin }>;
 export type Plugin = string | [string, any] | UnifiedPluginImport | [UnifiedPluginImport, any];