diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 3496de1b42e962143cad05490150b18b43969674..25ceee061ee56d0cfa0d64e27bcb22726c5c0b84 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9159,6 +9159,7 @@ static int qemuDomainGetBlockInfo(virDomainPtr dom,
     struct stat sb;
     int i;
     int format;
+    char *alias = NULL;
 
     virCheckFlags(0, -1);
 
@@ -9281,13 +9282,18 @@ static int qemuDomainGetBlockInfo(virDomainPtr dom,
         virDomainObjIsActive(vm)) {
         qemuDomainObjPrivatePtr priv = vm->privateData;
 
+        if (!(alias = strdup(disk->info.alias))) {
+            virReportOOMError();
+            goto cleanup;
+        }
+
         if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
             goto cleanup;
 
         if (virDomainObjIsActive(vm)) {
             qemuDomainObjEnterMonitor(driver, vm);
             ret = qemuMonitorGetBlockExtent(priv->mon,
-                                            disk->info.alias,
+                                            alias,
                                             &info->allocation);
             qemuDomainObjExitMonitor(driver, vm);
         } else {
@@ -9301,6 +9307,7 @@ static int qemuDomainGetBlockInfo(virDomainPtr dom,
     }
 
 cleanup:
+    VIR_FREE(alias);
     virStorageFileFreeMetadata(meta);
     VIR_FORCE_CLOSE(fd);
     if (vm)