diff --git a/src/bootstrap/clean.rs b/src/bootstrap/clean.rs
index 069f3d6acf1..7aa81893542 100644
--- a/src/bootstrap/clean.rs
+++ b/src/bootstrap/clean.rs
@@ -21,6 +21,7 @@ pub fn clean(build: &Build, all: bool) {
         rm_rf(&build.out.join("tmp"));
         rm_rf(&build.out.join("dist"));
         rm_rf(&build.out.join("bootstrap"));
+        rm_rf(&build.out.join("rustfmt.stamp"));
 
         for host in &build.hosts {
             let entries = match build.out.join(host.triple).read_dir() {