diff --git a/pkgbuild b/pkgbuild
index 3189ded..b904f01 100755
--- a/pkgbuild
+++ b/pkgbuild
@@ -9,4 +9,9 @@ set -e -x
 
 . ./prepare-env
 
+if [ $(uname -m) != $arch ]; then
+	echo You need an $arch host to build morpheus 1>&2
+	exit 1
+fi
+
 ./build "$1"