diff --git a/src/compiler/compile/css/Selector.ts b/src/compiler/compile/css/Selector.ts
index 07e2dc439e..5c6a8e6d89 100644
--- a/src/compiler/compile/css/Selector.ts
+++ b/src/compiler/compile/css/Selector.ts
@@ -350,7 +350,7 @@ function attribute_matches(node: CssNode, name: string, expected_value: string,
 	const attr = node.attributes.find((attr: CssNode) => attr.name === name);
 	if (!attr) return false;
 	if (attr.is_true) return operator === null;
-	if (!expected_value) return true;
+	if (expected_value === null) return true;
 
 	if (attr.chunks.length === 1) {
 		const value = attr.chunks[0];
diff --git a/test/css/samples/unused-selector-empty-attribute/_config.js b/test/css/samples/unused-selector-empty-attribute/_config.js
new file mode 100644
index 0000000000..6f77c6a3e1
--- /dev/null
+++ b/test/css/samples/unused-selector-empty-attribute/_config.js
@@ -0,0 +1,25 @@
+export default {
+	warnings: [{
+		filename: 'SvelteComponent.svelte',
+		code: 'css-unused-selector',
+		message: 'Unused CSS selector "img[alt=""]"',
+		start: {
+			character: 87,
+			column: 1,
+			line: 8
+		  },
+		end: {
+			character: 98,
+			column: 12,
+			line: 8
+		  },
+		pos: 87,
+		frame: `
+			 6:   }
+			 7:
+			 8:   img[alt=""] {
+			      ^
+			 9:     border: 1px solid red;
+			10:   }`
+	}]
+};
diff --git a/test/css/samples/unused-selector-empty-attribute/expected.css b/test/css/samples/unused-selector-empty-attribute/expected.css
new file mode 100644
index 0000000000..987fa142db
--- /dev/null
+++ b/test/css/samples/unused-selector-empty-attribute/expected.css
@@ -0,0 +1 @@
+img[alt].svelte-xyz{border:1px solid green}
\ No newline at end of file
diff --git a/test/css/samples/unused-selector-empty-attribute/expected.html b/test/css/samples/unused-selector-empty-attribute/expected.html
new file mode 100644
index 0000000000..889908c217
--- /dev/null
+++ b/test/css/samples/unused-selector-empty-attribute/expected.html
@@ -0,0 +1 @@
+<img alt="a foo" class="svelte-xyz" src="foo.jpg">
\ No newline at end of file
diff --git a/test/css/samples/unused-selector-empty-attribute/input.svelte b/test/css/samples/unused-selector-empty-attribute/input.svelte
new file mode 100644
index 0000000000..0200e537be
--- /dev/null
+++ b/test/css/samples/unused-selector-empty-attribute/input.svelte
@@ -0,0 +1,11 @@
+<img src="foo.jpg" alt="a foo" />
+
+<style>
+	img[alt] {
+		border: 1px solid green;
+	}
+
+	img[alt=""] {
+		border: 1px solid red;
+	}
+</style>