diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 7184784f20..cf45a88518 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -2169,7 +2169,8 @@ cmdBlockCopy(vshControl *ctl, const vshCmd *cmd)
             if (bandwidth) {
                 /* bandwidth is ulong MiB/s, but the typed parameter is
                  * ullong bytes/s; make sure we don't overflow */
-                if (bandwidth + 0ULL > ULLONG_MAX >> 20) {
+                unsigned long long limit = MIN(ULONG_MAX, ULLONG_MAX >> 20);
+                if (bandwidth > limit) {
                     virReportError(VIR_ERR_OVERFLOW,
                                    _("bandwidth must be less than %llu"),
                                    ULLONG_MAX >> 20);