diff --git a/packages/svelte/src/internal/server/payload.js b/packages/svelte/src/internal/server/payload.js
index 2cd74e1af7..acef2240cf 100644
--- a/packages/svelte/src/internal/server/payload.js
+++ b/packages/svelte/src/internal/server/payload.js
@@ -402,14 +402,6 @@ export class TreeState {
 		this.#mode = mode;
 	}
 
-	copy() {
-		const state = new TreeState(this.#mode);
-		state.#css = new Set(this.#css);
-		state.#head = this.#head.copy();
-		state.#uid = this.#uid;
-		return state;
-	}
-
 	/**
 	 * @param {TreeState} other
 	 */
diff --git a/packages/svelte/src/internal/server/payload.test.ts b/packages/svelte/src/internal/server/payload.test.ts
index 29e86262ba..53483c3fed 100644
--- a/packages/svelte/src/internal/server/payload.test.ts
+++ b/packages/svelte/src/internal/server/payload.test.ts
@@ -205,12 +205,9 @@ test('subsume refuses to switch modes', () => {
 	);
 });
 
-test('TreeState uid generator uses prefix and is shared by copy()', () => {
+test('TreeState uid generator uses prefix', () => {
 	const state = new TreeState('sync', 'id-');
 	assert.equal(state.uid(), 'id-s1');
-	const state_copy = state.copy();
-	assert.equal(state_copy.uid(), 'id-s2');
-	assert.equal(state.uid(), 'id-s3');
 });
 
 test('TreeHeadState title ordering favors later lexicographic paths', () => {