diff --git a/src/build.sh b/src/build.sh
index 6805088..2fdb64a 100644
--- a/src/build.sh
+++ b/src/build.sh
@@ -18,7 +18,7 @@ curl -RO "$DOWNLOAD"
 tar -xJf "firefox-$VERSION.source.tar.xz"
 
 
-cd "firefox-$VERSION/js/src"
+cd "firefox-$SUBVERSION/js/src"
 
 mkdir _build
 cd _build