diff --git a/packaging/android/apk/build.gradle b/packaging/android/apk/build.gradle
index 23718cc3a2..7618be7b27 100644
--- a/packaging/android/apk/build.gradle
+++ b/packaging/android/apk/build.gradle
@@ -1,106 +1,106 @@
 buildscript {
     repositories {
         google()
         jcenter()
     }
 
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.0'
     }
 }
 
 repositories {
     google()
     jcenter()
 }
 
 apply plugin: 'com.android.application'
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
 }
 
 ext {
     abi = System.getenv('ANDROID_ABI')
+    installPrefix = System.getenv('INSTALL_PREFIX')
 }
 
 task ("configure") {
     doLast {
         if (abi == null) {
             logger.error('ANDROID_ABI not specified using the default one instead: armeabi-7a')
         }
 
-        def installPrefix = System.getenv('INSTALL_PREFIX')
         if (installPrefix == null) {
             throw new GradleException('Please set INSTALL_PREFIX to the location where binaries are installed')
         }
 
         def libs = new File(installPrefix, 'lib')
         if (!libs.exists()) {
             throw new GradleException('Please run `make install` first')
         }
     }
 }
 
 // copy libs(plugins) which start with krita*.so and rename
 // them to start with `lib_`
 task copyLibs(type: Copy) {
-    from "${System.getenv('INSTALL_PREFIX')}/lib"
+    from "$installPrefix/lib"
     into "libs/${abi ?: 'armeabi-v7a'}"
     rename ('^krita(.*).so$', 'lib_krita$1.so')
 }
 
 task copyAssets(type: Copy) {
-    from "${System.getenv('INSTALL_PREFIX')}/share/"
+    from "$installPrefix/share/"
     into 'assets/'
     include '**'
 }
 
 copyLibs.dependsOn configure
 
 android {
     /*******************************************************
      * The following variables:
      * - androidBuildToolsVersion,
      * - androidCompileSdkVersion
      * - qt5AndroidDir - holds the path to qt android files
      *                   needed to build any Qt application
      *                   on Android.
      *
      * are defined in gradle.properties file. This file is
      * updated by QtCreator and androiddeployqt tools.
      * Changing them manually might break the compilation!
      *******************************************************/
 
     compileSdkVersion androidCompileSdkVersion.toInteger()
 
 
     sourceSets {
         main {
             manifest.srcFile 'AndroidManifest.xml'
             java.srcDirs = [qt5AndroidDir + '/src', 'src', 'java']
             aidl.srcDirs = [qt5AndroidDir + '/src', 'src', 'aidl']
             res.srcDirs = [qt5AndroidDir + '/res', 'res']
             resources.srcDirs = ['src']
             renderscript.srcDirs = ['src']
             assets.srcDirs = ['assets']
             jniLibs.srcDirs = ['libs', 'lib']
        }
     }
 
     // This is needed because, gradle by default ignores hidden assets.
     aaptOptions {
         ignoreAssetsPattern "!.foajasoie"
     }
 
     lintOptions {
         abortOnError false
     }
 	defaultConfig {
         targetSdkVersion 26
         minSdkVersion 21
     }
 
     preBuild.dependsOn(copyLibs)
     preBuild.dependsOn(copyAssets)
 }