diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index df7e405b3e..509ce5ac8b 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -6837,6 +6837,13 @@ virDomainSendKey(virDomainPtr domain,
     virCheckNonNullArgGoto(keycodes, error);
     virCheckPositiveArgGoto(nkeycodes, error);
 
+    if (codeset >= VIR_KEYCODE_SET_LAST) {
+        virReportInvalidArg(codeset,
+                            _("Unsupported codeset '%d'"),
+                            codeset);
+        goto error;
+    }
+
     if (nkeycodes > VIR_DOMAIN_SEND_KEY_MAX_KEYS) {
         virReportInvalidArg(nkeycodes,
                             _("nkeycodes must be <= %d"),