diff --git a/app/build.gradle b/app/build.gradle
index b210b9b..60db278 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -15,10 +15,10 @@ android {
     }
     signingConfigs {
         release {
-            storeFile file(RELEASE_STORE_FILE)
-            storePassword RELEASE_STORE_PASSWORD
-            keyAlias RELEASE_KEY_ALIAS
-            keyPassword RELEASE_KEY_PASSWORD
+            storeFile file(prop('RELEASE_STORE_FILE')?:'none')
+            storePassword prop('RELEASE_STORE_PASSWORD')
+            keyAlias prop('RELEASE_KEY_ALIAS')
+            keyPassword prop('RELEASE_KEY_PASSWORD')
         }
     }
     buildTypes {
diff --git a/build.gradle b/build.gradle
index ff317bb..f36649d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,3 +25,7 @@ task wrapper(type: Wrapper) {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
+
+def prop(String name) {
+    project.hasProperty(name) ? project.getProperty(name) : null
+}