diff --git a/app/build.gradle b/app/build.gradle
index 6af809c8..adca4e99 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -120,6 +120,7 @@ dependencies {
     implementation "com.android.support:percent:$supportLibVersion"
     implementation "com.android.support:preference-v7:$supportLibVersion"
     implementation "com.android.support:preference-v14:$supportLibVersion"
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 
     implementation 'com.github.kabouzeid:app-theme-helper:1.3.10'
     implementation 'com.github.kabouzeid:RecyclerView-FastScroll:1.0.16-kmod'