diff --git a/soong_ui.bash b/soong_ui.bash
index 724d9c5..e1af359 100755
--- a/soong_ui.bash
+++ b/soong_ui.bash
@@ -53,7 +53,7 @@
 {
     # Increment when microfactory changes enough that it cannot rebuild itself.
     # For example, if we use a new command line argument that doesn't work on older versions.
-    local mf_version=1
+    local mf_version=2
 
     local mf_src="${TOP}/build/soong/cmd/microfactory"