diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 9958b8553e..e5fb3f1afe 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -1432,6 +1432,8 @@ export function prop(props, key, flags, initial) {
 		}
 
 		value = /** @type {V} */ (initial);
+
+		if (setter) setter(value);
 	}
 
 	var getter = () => {
diff --git a/packages/svelte/tests/runtime-legacy/samples/binding-backflow/Child.svelte b/packages/svelte/tests/runtime-legacy/samples/binding-backflow/Child.svelte
index 4e0f779b12..e2865f9662 100644
--- a/packages/svelte/tests/runtime-legacy/samples/binding-backflow/Child.svelte
+++ b/packages/svelte/tests/runtime-legacy/samples/binding-backflow/Child.svelte
@@ -16,5 +16,5 @@
 	export let updates = [];
 	$: updates = [...updates, value];
 </script>
-  
+
 <div>child: {value?.foo} | updates: {updates.length}</div>
diff --git a/packages/svelte/tests/runtime-legacy/samples/binding-backflow/_config.js b/packages/svelte/tests/runtime-legacy/samples/binding-backflow/_config.js
index 9e1561f40e..7eefd6a75c 100644
--- a/packages/svelte/tests/runtime-legacy/samples/binding-backflow/_config.js
+++ b/packages/svelte/tests/runtime-legacy/samples/binding-backflow/_config.js
@@ -34,7 +34,7 @@ export default test({
 
 		p = parents['reactive_mutate'];
 		assert.deepEqual(p.value, { foo: 'kid' });
-		assert.equal(p.updates.length, 2);
+		assert.equal(p.updates.length, 1);
 
 		p = parents['init_update'];
 		assert.deepEqual(p.value, { foo: 'kid' });
@@ -42,6 +42,6 @@ export default test({
 
 		p = parents['init_mutate'];
 		assert.deepEqual(p.value, { foo: 'kid' });
-		assert.equal(p.updates.length, 2);
+		assert.equal(p.updates.length, 1);
 	}
 });