diff --git a/src/compiler/compile/render_dom/wrappers/IfBlock.ts b/src/compiler/compile/render_dom/wrappers/IfBlock.ts
index 557176bace20..b3bbf9becd77 100644
--- a/src/compiler/compile/render_dom/wrappers/IfBlock.ts
+++ b/src/compiler/compile/render_dom/wrappers/IfBlock.ts
@@ -391,7 +391,7 @@ export default class IfBlockWrapper extends Wrapper {
 						? b`
 						${snippet && (
 							dependencies.length > 0
-								? b`if (${block.renderer.dirty(dependencies)}) ${condition} = !!${snippet}`
+								? b`if (${condition} == null || ${block.renderer.dirty(dependencies)}) ${condition} = !!${snippet}`
 								: b`if (${condition} == null) ${condition} = !!${snippet}`
 						)}
 						if (${condition}) return ${i};`
diff --git a/test/runtime/samples/if-block-outro-computed-function/Foo.svelte b/test/runtime/samples/if-block-outro-computed-function/Foo.svelte
new file mode 100644
index 000000000000..19102815663d
--- /dev/null
+++ b/test/runtime/samples/if-block-outro-computed-function/Foo.svelte
@@ -0,0 +1 @@
+foo
\ No newline at end of file
diff --git a/test/runtime/samples/if-block-outro-computed-function/_config.js b/test/runtime/samples/if-block-outro-computed-function/_config.js
new file mode 100644
index 000000000000..69fd95d0085c
--- /dev/null
+++ b/test/runtime/samples/if-block-outro-computed-function/_config.js
@@ -0,0 +1,12 @@
+export default {
+	props: {
+		foo: true
+	},
+
+	html: 'foo',
+
+	test({ assert, component, target }) {
+		component.foo = false;
+		assert.htmlEqual(target.innerHTML, 'bar');
+	}
+};
diff --git a/test/runtime/samples/if-block-outro-computed-function/main.svelte b/test/runtime/samples/if-block-outro-computed-function/main.svelte
new file mode 100644
index 000000000000..adf7cc3e0b8c
--- /dev/null
+++ b/test/runtime/samples/if-block-outro-computed-function/main.svelte
@@ -0,0 +1,13 @@
+<script>
+	import Foo from './Foo.svelte'
+  export let foo = true
+	$: bar = () => true
+</script>
+
+{#if foo}
+	<Foo />
+{:else if bar()}
+	bar
+{:else}
+	else
+{/if}