diff --git a/tools/cross-build-world.sh b/tools/cross-build-world.sh
index 5d91032f7f28da5bbb76df1a9f7a46a0e40ab830..7eb23d43f747b391af5e051b86d739c329f78dcb 100755
--- a/tools/cross-build-world.sh
+++ b/tools/cross-build-world.sh
@@ -17,7 +17,7 @@ do
       r) BUILD_RUNTIME=yes ;;
       l) LOAD_KERNEL=yes ;;
       B) BOOTSTRAP=$OPTARG ;;
-      B) MAKE=$OPTARG ;;
+      G) MAKE=$OPTARG ;;
       h | \?) usage; exit 1 ;;
     esac
 done