diff --git a/.hgignore b/.hgignore
index 6e20e29ee4a7..0c097fc05eae 100644
--- a/.hgignore
+++ b/.hgignore
@@ -297,3 +297,6 @@ gfx/wr/target/
 
 # Ignore automatically generated mots documentation
 ^docs/mots/index.rst
+
+# Ignore generated directory with .class files for GeckoView annotation processor
+^mobile/android/annotations/bin/