diff --git a/app/build.gradle b/app/build.gradle
index 890640584..a9e4c5120 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -177,6 +177,7 @@ if (firebaseEnabled()) {
 task generateContactsXml(type: Copy) {
     from 'contacts.xml'
     into "src/main/res/xml/"
+    outputs.upToDateWhen { file('src/main/res/xml/contacts.xml').exists() }
     filter {
         line -> line
                 .replaceAll('%%AUTO_GENERATED%%', 'This file has been automatically generated, do not edit or commit !')