diff --git a/bp2build/symlink_forest.go b/bp2build/symlink_forest.go
index 5c33308..966b94a 100644
--- a/bp2build/symlink_forest.go
+++ b/bp2build/symlink_forest.go
@@ -43,7 +43,7 @@
 // clean the whole symlink forest and recreate it. This number can be bumped whenever there's
 // an incompatible change to the forest layout or a bug in incrementality that needs to be fixed
 // on machines that may still have the bug present in their forest.
-const symlinkForestVersion = 1
+const symlinkForestVersion = 2
 
 type instructionsNode struct {
 	name     string