diff --git a/ultrasonic/build.gradle b/ultrasonic/build.gradle
index 21497c6d..01f5c64f 100644
--- a/ultrasonic/build.gradle
+++ b/ultrasonic/build.gradle
@@ -51,6 +51,7 @@ android {
         warning 'ImpliedQuantity'
         disable 'IconMissingDensityFolder'
         abortOnError true
+        warningsAsErrors true
     }
 
     kotlinOptions {