diff --git a/.changeset/tough-beans-marry.md b/.changeset/tough-beans-marry.md
new file mode 100644
index 0000000000..049a98dbdf
--- /dev/null
+++ b/.changeset/tough-beans-marry.md
@@ -0,0 +1,5 @@
+---
+'@lit-labs/ssr': patch
+---
+
+Remove `abstract` from members of the ElementRendererConstructor type
diff --git a/packages/labs/ssr/src/lib/element-renderer.ts b/packages/labs/ssr/src/lib/element-renderer.ts
index 1a7a269e9f..330197fe29 100644
--- a/packages/labs/ssr/src/lib/element-renderer.ts
+++ b/packages/labs/ssr/src/lib/element-renderer.ts
@@ -10,11 +10,13 @@ import {escapeHtml} from './util/escape-html.js';
 import type {RenderInfo} from './render-value.js';
 import type {RenderResult} from './render-result.js';
 
-export type Constructor<T> = {new (): T};
+type Interface<T> = {
+  [P in keyof T]: T[P];
+};
 
 export type ElementRendererConstructor = (new (
   tagName: string
-) => ElementRenderer) &
+) => Interface<ElementRenderer>) &
   typeof ElementRenderer;
 
 type AttributesMap = Map<string, string>;