diff --git a/script/ci/cargo-clean-on-new-rustc-version.sh b/script/ci/cargo-clean-on-new-rustc-version.sh
index 949f070b996..38d56f89db5 100755
--- a/script/ci/cargo-clean-on-new-rustc-version.sh
+++ b/script/ci/cargo-clean-on-new-rustc-version.sh
@@ -3,7 +3,7 @@
 set -e
 
 manual_stamp_file=target/ci_manual_stamp
-manual_stamp=0 # Change this to force a clean build on CI
+manual_stamp=1 # Change this to force a clean build on CI
 
 if [ -f $manual_stamp_file ]; then
     if echo "$manual_stamp" | cmp -s $manual_stamp_file -; then
@@ -11,10 +11,15 @@ if [ -f $manual_stamp_file ]; then
     else
         echo "A clean build has been requested, running cargo clean"
         cargo clean
-        # The target/ directory is now gone, and the messages below will not be printed
     fi
+else
+    echo "Existing stamp not found, running cargo clean"
+    cargo clean
 fi
 
+# If `cargo clean` was run above, then the target/ directory is now
+# gone and the messages below will not be printed
+
 stamp_file=target/rustc_version_stamp
 current_version=$(rustc --version)