diff --git a/spec/px-to-viewport.spec.js b/spec/px-to-viewport.spec.js
index 628ad85..ba0747b 100644
--- a/spec/px-to-viewport.spec.js
+++ b/spec/px-to-viewport.spec.js
@@ -59,12 +59,9 @@ describe('value parsing', function() {
   });
 
   it('should not replace values with an uppercase P or X', function () {
-    var options = {
-        propList: ['*']
-    };
     var rules = '.rule { margin: 12px calc(100% - 14PX); height: calc(100% - 20px); font-size: 12Px; line-height: 16px; }';
     var expected = '.rule { margin: 3.75vw calc(100% - 14PX); height: calc(100% - 6.25vw); font-size: 12Px; line-height: 5vw; }';
-    var processed = postcss(pxToViewport(options)).process(rules).css;
+    var processed = postcss(pxToViewport()).process(rules).css;
 
     expect(processed).toBe(expected);
   });