diff --git a/.changeset/eight-waves-mate.md b/.changeset/eight-waves-mate.md
new file mode 100644
index 0000000000..3c6dd1b776
--- /dev/null
+++ b/.changeset/eight-waves-mate.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: avoid migrating slots in custom elements
diff --git a/packages/svelte/src/compiler/migrate/index.js b/packages/svelte/src/compiler/migrate/index.js
index d3b386aed2..9b1dc00e57 100644
--- a/packages/svelte/src/compiler/migrate/index.js
+++ b/packages/svelte/src/compiler/migrate/index.js
@@ -599,6 +599,7 @@ const template = {
 		next();
 	},
 	SlotElement(node, { state, next }) {
+		if (state.analysis.custom_element) return;
 		let name = 'children';
 		let slot_name = 'default';
 		let slot_props = '{ ';
diff --git a/packages/svelte/tests/migrate/samples/slots-custom-element/input.svelte b/packages/svelte/tests/migrate/samples/slots-custom-element/input.svelte
new file mode 100644
index 0000000000..3063b32517
--- /dev/null
+++ b/packages/svelte/tests/migrate/samples/slots-custom-element/input.svelte
@@ -0,0 +1,23 @@
+<svelte:options customElement="my-element" />
+
+<script>
+	// to show that it doesn't bail out from the whole migration
+	let count = 0;
+</script>
+
+<button on:click={()=>count++}><slot /></button>
+
+{count}
+
+{#if foo}
+	<slot name="foo" {foo} />
+{/if}
+
+{#if $$slots.bar}
+	{$$slots}
+	<slot name="bar" />
+{/if}
+
+{#if $$slots.default}foo{/if}
+
+<slot name="dashed-name" />
diff --git a/packages/svelte/tests/migrate/samples/slots-custom-element/output.svelte b/packages/svelte/tests/migrate/samples/slots-custom-element/output.svelte
new file mode 100644
index 0000000000..8f530891a2
--- /dev/null
+++ b/packages/svelte/tests/migrate/samples/slots-custom-element/output.svelte
@@ -0,0 +1,23 @@
+<svelte:options customElement="my-element" />
+
+<script>
+	// to show that it doesn't bail out from the whole migration
+	let count = $state(0);
+</script>
+
+<button onclick={()=>count++}><slot /></button>
+
+{count}
+
+{#if foo}
+	<slot name="foo" {foo} />
+{/if}
+
+{#if bar}
+	{$$slots}
+	<slot name="bar" />
+{/if}
+
+{#if children}foo{/if}
+
+<slot name="dashed-name" />
\ No newline at end of file