diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 572cea0d40..738e8832cc 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -17864,8 +17864,8 @@ qemuDomainBlockJobSetSpeed(virDomainPtr dom,
     virDomainDiskDefPtr disk;
     int ret = -1;
     virDomainObjPtr vm;
-    g_autofree char *device = NULL;
     unsigned long long speed = bandwidth;
+    g_autoptr(qemuBlockJobData) job = NULL;
 
     virCheckFlags(VIR_DOMAIN_BLOCK_JOB_SPEED_BANDWIDTH_BYTES, -1);
 
@@ -17895,12 +17895,15 @@ qemuDomainBlockJobSetSpeed(virDomainPtr dom,
     if (!(disk = qemuDomainDiskByName(vm->def, path)))
         goto endjob;
 
-    if (!(device = qemuAliasDiskDriveFromDisk(disk)))
+    if (!(job = qemuBlockJobDiskGetJob(disk))) {
+        virReportError(VIR_ERR_INVALID_ARG,
+                       _("disk %s does not have an active block job"), disk->dst);
         goto endjob;
+    }
 
     qemuDomainObjEnterMonitor(driver, vm);
     ret = qemuMonitorBlockJobSetSpeed(qemuDomainGetMonitor(vm),
-                                      device,
+                                      job->name,
                                       speed);
     if (qemuDomainObjExitMonitor(driver, vm) < 0)
         ret = -1;