diff --git a/lib/instrumenters/noop.js b/lib/instrumenters/noop.js
index 1f0f09470..8a57b4a20 100644
--- a/lib/instrumenters/noop.js
+++ b/lib/instrumenters/noop.js
@@ -3,12 +3,12 @@ var readInitialCoverage = require('istanbul-lib-instrument').readInitialCoverage
 
 function NOOP () {
   return {
-    instrumentSync: function (code) {
+    instrumentSync: function (code, filename) {
       var extracted = readInitialCoverage(code)
       if (extracted) {
         this.fileCoverage = new FileCoverage(extracted.coverageData)
       } else {
-        this.fileCoverage = null
+        this.fileCoverage = new FileCoverage(filename)
       }
       return code
     },