diff --git a/src/cmdlib.sh b/src/cmdlib.sh
index f3c6acc0df..059c2b65cf 100755
--- a/src/cmdlib.sh
+++ b/src/cmdlib.sh
@@ -41,6 +41,8 @@ case $arch in
     "ppc64le") DEFAULT_TERMINAL="hvc0"           ;;
     "aarch64") DEFAULT_TERMINAL="ttyAMA0"        ;;
     "s390x")   DEFAULT_TERMINAL="ttysclp0"       ;;
+    # minimal support; the rest of cosa isn't yet riscv64-aware
+    "riscv64") DEFAULT_TERMINAL="ttyS0"          ;;
     *)         fatal "Architecture ${arch} not supported"
 esac
 export DEFAULT_TERMINAL