diff --git a/build/aspnet5-version.js b/build/aspnet5-version.js
index 96959486f..ebdfc3706 100644
--- a/build/aspnet5-version.js
+++ b/build/aspnet5-version.js
@@ -2,7 +2,7 @@
 var util = require('util');
 
 var file = '../src/imageprocessor/project.json';
-var buildNumber = process.env.APPVEYOR_BUILD_NUMBER;
+var buildNumber = process.env.APPVEYOR_BUILD_VERSION;
 
 jsonfile.readFile(file, function (err, project) {
     project.version = buildNumber;