diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 53ad478c8a12a54faf7fc5f7661328cc84a91a0d..3db344748283d15546b08c2b4ae28cb9c54d86e8 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -13624,6 +13624,13 @@ qemuDomainSetBlockIoTune(virDomainPtr dom,
     for (i = 0; i < nparams; i++) {
         virTypedParameterPtr param = &params[i];
 
+        if (param->value.ul > LLONG_MAX) {
+            virReportError(VIR_ERR_OVERFLOW,
+                           _("block I/O throttle limit value must"
+                             " be less than %llu"), LLONG_MAX);
+            goto endjob;
+        }
+
         if (STREQ(param->field, VIR_DOMAIN_BLOCK_IOTUNE_TOTAL_BYTES_SEC)) {
             info.total_bytes_sec = param->value.ul;
             set_bytes = true;