diff --git a/app/build.gradle b/app/build.gradle
index 37ff40b..6b61cbe 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,7 +4,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:0.6.+'
-	classpath 'com.neenbedankt.gradle.plugins:android-apt:1.1'
+        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.1'
     }
 }
 apply plugin: 'android'
@@ -26,7 +26,7 @@ android {
 
 dependencies {
     // Commons IO
-    compile 'commons-io:commons-io:2.4'
+    compile "commons-io:commons-io:${commonsioVersion}"
 
     // Dagger
     apt "com.squareup.dagger:dagger-compiler:${daggerVersion}"
diff --git a/build.gradle b/build.gradle
index 17bc819..e493dbd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,8 +1,9 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 // Dependencies
-ext.absVersion = '4.4.0';
-ext.butterknifeVersion = '4.0.1';
-ext.daggerVersion = '1.2.0';
-ext.ottoVersion = '1.3.4';
-ext.supportv4Version = '18.0.+';
+ext.absVersion = '4.4.0'
+ext.butterknifeVersion = '4.0.1'
+ext.commonsioVersion = '2.4'
+ext.daggerVersion = '1.2.0'
+ext.ottoVersion = '1.3.4'
+ext.supportv4Version = '18.0.+'