diff --git a/build.sh b/build.sh
index 04b2de25488676f0564f420cf575686b2cb3d786..69496a738955321f3d31e169a8ecdd28a0c31443 100755
--- a/build.sh
+++ b/build.sh
@@ -99,7 +99,8 @@ while getopts :b:d:cCeEhiI:j:orstvfX: optchr; do
       containerize=1
       ;;
     d)
-      build_prefix="$OPTARG"
+      build_dir_name="$OPTARG"
+      build_prefix="$dir/$build_dir_name"
       containerized_opts+=(-$optchr "$OPTARG")
       ;;
     e)