diff --git a/.changeset/silly-bulldogs-rest.md b/.changeset/silly-bulldogs-rest.md
new file mode 100644
index 000000000000..f92eb81575b7
--- /dev/null
+++ b/.changeset/silly-bulldogs-rest.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: pass along `anchor` in legacy class wrappers
diff --git a/packages/svelte/src/legacy/legacy-client.js b/packages/svelte/src/legacy/legacy-client.js
index 4148f3d1cd59..c7684570bba7 100644
--- a/packages/svelte/src/legacy/legacy-client.js
+++ b/packages/svelte/src/legacy/legacy-client.js
@@ -110,6 +110,7 @@ class Svelte4Component {
 
 		this.#instance = (options.hydrate ? hydrate : mount)(options.component, {
 			target: options.target,
+			anchor: options.anchor,
 			props,
 			context: options.context,
 			intro: options.intro ?? false,