diff --git a/OpenKeychain/build.gradle b/OpenKeychain/build.gradle
index 9c06305b6..917f55fe8 100644
--- a/OpenKeychain/build.gradle
+++ b/OpenKeychain/build.gradle
@@ -106,6 +106,7 @@ dependencies {
     annotationProcessor "android.arch.lifecycle:compiler:1.0.0"
 
     compile "android.arch.persistence:db-framework:1.0.0"
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 
     // for debugging the db. don't enable by default, this will expose the database no the network!
     // debugImplementation 'com.amitshekhar.android:debug-db:1.0.3'