diff --git a/extra/openmpi/PKGBUILD b/extra/openmpi/PKGBUILD
index e7d86d138..cc18e2ed6 100644
--- a/extra/openmpi/PKGBUILD
+++ b/extra/openmpi/PKGBUILD
@@ -5,6 +5,9 @@
 
 # ALARM: Kevin Mihelich <kevin@archlinuxarm.org
 #  - remove make/optdepend on cuda and configure option
+#  - build for v8 only, 32-bit support dropped in version 5
+
+buildarch=8
 
 pkgbase=openmpi
 pkgname=(