diff --git a/browser_patches/firefox/build.sh b/browser_patches/firefox/build.sh
index 27eb5af600128..620bb91de4869 100755
--- a/browser_patches/firefox/build.sh
+++ b/browser_patches/firefox/build.sh
@@ -80,7 +80,8 @@ echo "mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/${OBJ_FOLDER}" >> .mozconfig
 if [[ $1 == "--full" ]]; then
   if [[ "$(uname)" == "Darwin" && "$(uname -m)" == "arm64" ]]; then
     ./mach artifact toolchain --from-build macosx64-node
-    mv node "$HOME/.mozbuild/node"
+    rm -rf "$HOME/.mozbuild/node"
+    mv node "$HOME/.mozbuild/"
   elif [[ "$(uname)" == "Darwin" || "$(uname)" == "Linux" ]]; then
     SHELL=/bin/sh ./mach bootstrap --application-choice=browser --no-interactive --no-system-changes
   fi