diff --git a/src/parse/read/expression.js b/src/parse/read/expression.js
index 61cebc9cc7..110b6af4ef 100644
--- a/src/parse/read/expression.js
+++ b/src/parse/read/expression.js
@@ -4,7 +4,7 @@ export default function readExpression ( parser ) {
 	const start = parser.index;
 
 	const name = parser.readUntil( /\s*}}/ );
-	if ( name && /^\w+$/.test( name ) ) {
+	if ( name && /^[a-z]+$/.test( name ) ) {
 		return {
 			type: 'Identifier',
 			start,
diff --git a/test/generator/samples/attribute-dynamic-reserved/_config.js b/test/generator/samples/attribute-dynamic-reserved/_config.js
index e14059fec0..e0e349b7bc 100644
--- a/test/generator/samples/attribute-dynamic-reserved/_config.js
+++ b/test/generator/samples/attribute-dynamic-reserved/_config.js
@@ -3,12 +3,12 @@ export default {
 		class: 'foo'
 	},
 
-	html: `<div class="foo"></div>`,
+	html: `<div class="foo"></div>123`,
 
 	test ( assert, component, target ) {
 		component.set({ class: 'bar' });
-		assert.equal( target.innerHTML, `<div class="bar"></div>` );
-		
+		assert.equal( target.innerHTML, `<div class="bar"></div>123` );
+
 		component.destroy();
 	}
 };
diff --git a/test/generator/samples/attribute-dynamic-reserved/main.html b/test/generator/samples/attribute-dynamic-reserved/main.html
index 6b149d165f..47185118e2 100644
--- a/test/generator/samples/attribute-dynamic-reserved/main.html
+++ b/test/generator/samples/attribute-dynamic-reserved/main.html
@@ -1 +1 @@
-<div class='{{class}}'></div>
\ No newline at end of file
+<div class='{{class}}'></div>{{123}}