diff --git a/projects/spidermonkey-ufi/build.sh b/projects/spidermonkey-ufi/build.sh
index 7cbcfa0e8..cb2d4f693 100755
--- a/projects/spidermonkey-ufi/build.sh
+++ b/projects/spidermonkey-ufi/build.sh
@@ -28,7 +28,9 @@ rustup default nightly
 # Install dependencies.
 export MOZBUILD_STATE_PATH=/root/.mozbuild
 export SHELL=/bin/bash
-../../mach --no-interactive bootstrap --application-choice browser
+cd ../../
+./mach --no-interactive bootstrap --application-choice browser
+cd js/src/
 
 autoconf2.13