diff --git a/build/appveyor-project-version-patch.js b/build/appveyor-project-version-patch.js
index 0f8846fcd..c1314af13 100644
--- a/build/appveyor-project-version-patch.js
+++ b/build/appveyor-project-version-patch.js
@@ -4,14 +4,14 @@ var semver = require("semver");
 var file = "../src/imagesharp/project.json";
 var buildVersion = process.env.APPVEYOR_BUILD_VERSION.substring(1);
 
-var findPoint       = buildVersion.lastIndexOf(".");
-var basePackageVer  = buildVersion.substring(0, findPoint);
-var buildNumber     = buildVersion.substring(findPoint + 1, buildVersion.length);
-var semversion = semver.valid(basePackageVer + "-alpha" + buildNumber);
+var findPoint = buildVersion.lastIndexOf(".");
+var basePackageVer = buildVersion.substring(0, findPoint);
+var buildNumber = buildVersion.substring(findPoint + 1, buildVersion.length);
+var semversion = semver.valid(basePackageVer + "-alpha" + buildNumber.length === 2 ? buildNumber : "0" + buildNumber);
 
 jsonfile.readFile(file, function (err, project) {
-	project.version = semversion;
-	jsonfile.writeFile(file, project, {spaces: 2}, function(err) {
-		console.error(err);
-	});
+    project.version = semversion;
+    jsonfile.writeFile(file, project, { spaces: 2 }, function (err) {
+        console.error(err);
+    });
 })
\ No newline at end of file