diff --git a/build.sh b/build.sh
index 847fd827..50dfded9 100755
--- a/build.sh
+++ b/build.sh
@@ -57,6 +57,9 @@ case "${1:-default}" in
 		go run build.go -goos freebsd -goarch amd64 tar
 		go run build.go -goos freebsd -goarch 386 tar
 
+		go run build.go -goos openbsd -goarch amd64 tar
+		go run build.go -goos openbsd -goarch 386 tar
+
 		go run build.go -goos darwin -goarch amd64 tar
 
 		go run build.go -goos windows -goarch amd64 zip
diff --git a/cmd/syncthing/memsize_unimpl.go b/cmd/syncthing/memsize_unimpl.go
index c226efa7..05b0c2d6 100644
--- a/cmd/syncthing/memsize_unimpl.go
+++ b/cmd/syncthing/memsize_unimpl.go
@@ -13,7 +13,7 @@
 // You should have received a copy of the GNU General Public License along
 // with this program. If not, see <http://www.gnu.org/licenses/>.
 
-// +build freebsd
+// +build freebsd openbsd
 
 package main