diff --git a/library/build.gradle b/library/build.gradle
index 97f8a84f33..b9ad6e2061 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -77,6 +77,7 @@ android.libraryVariants.all { variant ->
         options {
             links "http://docs.oracle.com/javase/7/docs/api/"
             linksOffline "https://developer.android.com/reference","${android.sdkDirectory}/docs/reference"
+            encoding = 'UTF-8'
         }
         exclude '**/BuildConfig.java'
         exclude '**/R.java'