diff --git a/src/compile/render-dom/wrappers/Element/StyleAttribute.ts b/src/compile/render-dom/wrappers/Element/StyleAttribute.ts
index b0a3663c63..43524ff372 100644
--- a/src/compile/render-dom/wrappers/Element/StyleAttribute.ts
+++ b/src/compile/render-dom/wrappers/Element/StyleAttribute.ts
@@ -122,7 +122,7 @@ function get_style_value(chunks: Node[]) {
 				} else if (char === '\\') {
 					escaped = true;
 				} else if (char === quote_mark) {
-					quote_mark === null;
+					quote_mark = null;
 				} else if (char === '"' || char === "'") {
 					quote_mark = char;
 				} else if (char === ')' && in_url) {
@@ -173,4 +173,4 @@ function get_style_value(chunks: Node[]) {
 
 function is_dynamic(value: Node[]) {
 	return value.length > 1 || value[0].type !== 'Text';
-}
\ No newline at end of file
+}
diff --git a/test/runtime/samples/attribute-url/_config.js b/test/runtime/samples/attribute-url/_config.js
new file mode 100644
index 0000000000..28bc1bcb0c
--- /dev/null
+++ b/test/runtime/samples/attribute-url/_config.js
@@ -0,0 +1,8 @@
+export default {
+	test({ assert, target }) {
+		const div = target.querySelector( 'div' );
+
+		assert.equal( div.style.backgroundImage, 'url(https://example.com/foo.jpg)');
+		assert.equal( div.style.color, 'red' );
+	}
+};
diff --git a/test/runtime/samples/attribute-url/main.svelte b/test/runtime/samples/attribute-url/main.svelte
new file mode 100644
index 0000000000..357a352aaa
--- /dev/null
+++ b/test/runtime/samples/attribute-url/main.svelte
@@ -0,0 +1,6 @@
+<script>
+	let bgImage = 'https://example.com/foo.jpg';
+	let color = 'red';
+</script>
+
+<div style="background-image: url('{bgImage}'); color: {color};">{color}</div>