diff --git a/build.sh b/build.sh
index 58c8096f7dc02a7394a5d640cebdd5dbbc88e97f..549998059c79cc69d2f15c1c30b0c597df2ba7c4 100755
--- a/build.sh
+++ b/build.sh
@@ -114,7 +114,8 @@ while getopts :aAb: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")
       ;;
     f)