diff --git a/xwords4/android/XWords4/app/build.gradle b/xwords4/android/XWords4/app/build.gradle
index 9268abc8f..5642ecec8 100644
--- a/xwords4/android/XWords4/app/build.gradle
+++ b/xwords4/android/XWords4/app/build.gradle
@@ -12,6 +12,7 @@ apply plugin: 'com.android.application'
 
 dependencies {
     compile files('../libs/gcm.jar')
+    compile files('../libs/android-support-v13.jar')
 }
 
 android {