diff --git a/.hgignore b/.hgignore
index 89af9ba..74486a6 100644
--- a/.hgignore
+++ b/.hgignore
@@ -21,3 +21,8 @@
 # Files generated by Windows Explorer
 (^|/)Desktop\.ini$
 (^|/)Thumbs\.db$
+
+# AMBuild build directories
+syntax: glob
+build/*
+obj-*/