diff --git a/increment_version.rb b/increment_version.rb
old mode 100644
new mode 100755
index 745ff1c2e..efd1201f4
--- a/increment_version.rb
+++ b/increment_version.rb
@@ -4,7 +4,7 @@
 
 # manifest update
 file = File.read("Paco/AndroidManifest.xml")
-xml = REXML::Document.new(file)
+doc = REXML::Document.new(file)
 current_version = doc.elements["manifest"].attributes["android:versionCode"].to_i
 doc.elements["manifest"].attributes["android:versionCode"] = "#{current_version + 1}"