diff --git a/test/inject.js b/test/inject.js
index a602c6c..5d4371c 100644
--- a/test/inject.js
+++ b/test/inject.js
@@ -31,7 +31,7 @@ test('throws', () => {
 		assert.unreachable('should throw');
 	} catch (err) {
 		assert.instance(err, TypeError);
-		assert.is(err.message, `Cannot read property 'foo' of undefined`);
+		assert.match(err.message, /Cannot read propert(ies|y 'foo') of undefined/);
 	}
 });