diff --git a/services/Android.bp b/services/Android.bp
index c8b4969..4623ff9 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -17,6 +17,7 @@
             "-Xep:AndroidFrameworkCompatChange:ERROR",
             // "-Xep:AndroidFrameworkUid:ERROR",
             "-Xep:SelfEquals:ERROR",
+            "-Xep:NullTernary:ERROR",
             // NOTE: only enable to generate local patchfiles
             // "-XepPatchChecks:refaster:frameworks/base/errorprone/refaster/EfficientXml.java.refaster",
             // "-XepPatchLocation:/tmp/refaster/",