diff --git a/mobile/com.sap.sailing.android.tracking.app/build.gradle b/mobile/com.sap.sailing.android.tracking.app/build.gradle
index e57c73dd535..f71081cc3f7 100644
--- a/mobile/com.sap.sailing.android.tracking.app/build.gradle
+++ b/mobile/com.sap.sailing.android.tracking.app/build.gradle
@@ -13,7 +13,7 @@ android {
         targetSdkVersion 21
         versionCode verCode
         versionName "$verCode - Altitude"
-        useJack false
+        useJack true
     }
 
     sourceSets {
@@ -30,8 +30,10 @@ android {
             applicationIdSuffix ".dev"
             versionNameSuffix ".debug"
 
+/*
             minifyEnabled true
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-project.txt", "../proguard-mobile.txt"
+*/
         }
 
         release {
diff --git a/mobile/com.sap.sailing.racecommittee.app/build.gradle b/mobile/com.sap.sailing.racecommittee.app/build.gradle
index 66656e8ec00..d7fe705c696 100644
--- a/mobile/com.sap.sailing.racecommittee.app/build.gradle
+++ b/mobile/com.sap.sailing.racecommittee.app/build.gradle
@@ -13,7 +13,7 @@ android {
         targetSdkVersion 21
         versionCode verCode
         versionName "$verCode - Laser"
-        useJack false
+        useJack true
     }
 
     sourceSets {
@@ -30,8 +30,10 @@ android {
             applicationIdSuffix ".dev"
             versionNameSuffix ".debug"
 
+/*
             minifyEnabled true
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-project.txt", "../proguard-mobile.txt"
+*/
         }
 
         release {