diff --git a/l/tree-sitter-module/SlackBuild b/l/tree-sitter-module/SlackBuild
index 877e6cff..54b45de3 100755
--- a/l/tree-sitter-module/SlackBuild
+++ b/l/tree-sitter-module/SlackBuild
@@ -19,6 +19,9 @@ fi
 TMP=${TMP:-/tmp/$TAG}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
+
+PREFIX=${PREFIX:-/usr}
+
 REPOSITORY=/home/installs/SlackBuilds/_repositories/$PRGNAM
 
 set -e