diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 625d955275..0553cb7fa0 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5490,12 +5490,15 @@ qemuBuildRNGBackendChrdevStr(virLogManagerPtr logManager,
 int
 qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
                          virQEMUCapsPtr qemuCaps,
-                         const char **type,
                          virJSONValuePtr *props)
 {
+    char *objAlias = NULL;
     char *charBackendAlias = NULL;
     int ret = -1;
 
+    if (virAsprintf(&objAlias, "obj%s", rng->info.alias) < 0)
+        goto cleanup;
+
     switch ((virDomainRNGBackend) rng->backend) {
     case VIR_DOMAIN_RNG_BACKEND_RANDOM:
         if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_OBJECT_RNG_RANDOM)) {
@@ -5505,11 +5508,11 @@ qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
             goto cleanup;
         }
 
-        *type = "rng-random";
-
-        if (virJSONValueObjectCreate(props, "s:filename", rng->source.file,
-                                     NULL) < 0)
+        if (qemuMonitorCreateObjectProps(props, "rng-random", objAlias,
+                                         "s:filename", rng->source.file,
+                                         NULL) < 0)
             goto cleanup;
+
         break;
 
     case VIR_DOMAIN_RNG_BACKEND_EGD:
@@ -5520,13 +5523,12 @@ qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
             goto cleanup;
         }
 
-        *type = "rng-egd";
-
         if (!(charBackendAlias = qemuAliasChardevFromDevAlias(rng->info.alias)))
             goto cleanup;
 
-        if (virJSONValueObjectCreate(props, "s:chardev", charBackendAlias,
-                                     NULL) < 0)
+        if (qemuMonitorCreateObjectProps(props, "rng-egd", objAlias,
+                                         "s:chardev", charBackendAlias,
+                                         NULL) < 0)
             goto cleanup;
 
         break;
@@ -5540,35 +5542,12 @@ qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
     ret = 0;
 
  cleanup:
+    VIR_FREE(objAlias);
     VIR_FREE(charBackendAlias);
     return ret;
 }
 
 
-static char *
-qemuBuildRNGBackendStr(virDomainRNGDefPtr rng,
-                       virQEMUCapsPtr qemuCaps)
-{
-    const char *type = NULL;
-    char *alias = NULL;
-    virJSONValuePtr props = NULL;
-    char *ret = NULL;
-
-    if (virAsprintf(&alias, "obj%s", rng->info.alias) < 0)
-        goto cleanup;
-
-    if (qemuBuildRNGBackendProps(rng, qemuCaps, &type, &props) < 0)
-        goto cleanup;
-
-    ret = virQEMUBuildObjectCommandlineFromJSONType(type, alias, props);
-
- cleanup:
-    VIR_FREE(alias);
-    virJSONValueFree(props);
-    return ret;
-}
-
-
 char *
 qemuBuildRNGDevStr(const virDomainDef *def,
                    virDomainRNGDefPtr dev,
@@ -5636,8 +5615,11 @@ qemuBuildRNGCommandLine(virLogManagerPtr logManager,
     size_t i;
 
     for (i = 0; i < def->nrngs; i++) {
+        virJSONValuePtr props;
+        virBuffer buf = VIR_BUFFER_INITIALIZER;
         virDomainRNGDefPtr rng = def->rngs[i];
         char *tmp;
+        int rc;
 
         if (!rng->info.alias) {
             virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -5656,12 +5638,17 @@ qemuBuildRNGCommandLine(virLogManagerPtr logManager,
             VIR_FREE(tmp);
         }
 
-        /* add the RNG source backend */
-        if (!(tmp = qemuBuildRNGBackendStr(rng, qemuCaps)))
+        if (qemuBuildRNGBackendProps(rng, qemuCaps, &props) < 0)
             return -1;
 
-        virCommandAddArgList(cmd, "-object", tmp, NULL);
-        VIR_FREE(tmp);
+        rc = virQEMUBuildObjectCommandlineFromJSON(&buf, props);
+        virJSONValueFree(props);
+
+        if (rc < 0)
+            return -1;
+
+        virCommandAddArg(cmd, "-object");
+        virCommandAddArgBuffer(cmd, &buf);
 
         /* add the device */
         if (!(tmp = qemuBuildRNGDevStr(def, rng, qemuCaps)))
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 9a7fed2934..b47caf7ec0 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -142,7 +142,6 @@ char *qemuBuildRNGDevStr(const virDomainDef *def,
                          virQEMUCapsPtr qemuCaps);
 int qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
                              virQEMUCapsPtr qemuCaps,
-                             const char **type,
                              virJSONValuePtr *props);
 
 int qemuOpenPCIConfig(virDomainHostdevDefPtr dev);
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index f8b456cc3a..1027005a65 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1979,11 +1979,8 @@ qemuDomainAttachRNGDevice(virQEMUDriverPtr driver,
     bool teardowncgroup = false;
     bool teardowndevice = false;
     bool chardevAdded = false;
-    bool objAdded = false;
     virJSONValuePtr props = NULL;
-    const char *type;
     int ret = -1;
-    int rv;
 
     if (qemuAssignDeviceRNGAlias(vm->def, rng) < 0)
         goto cleanup;
@@ -2007,10 +2004,7 @@ qemuDomainAttachRNGDevice(virQEMUDriverPtr driver,
     if (!(devstr = qemuBuildRNGDevStr(vm->def, rng, priv->qemuCaps)))
         goto cleanup;
 
-    if (qemuBuildRNGBackendProps(rng, priv->qemuCaps, &type, &props) < 0)
-        goto cleanup;
-
-    if (virAsprintf(&objAlias, "obj%s", rng->info.alias) < 0)
+    if (qemuBuildRNGBackendProps(rng, priv->qemuCaps, &props) < 0)
         goto cleanup;
 
     if (!(charAlias = qemuAliasChardevFromDevAlias(rng->info.alias)))
@@ -2032,11 +2026,8 @@ qemuDomainAttachRNGDevice(virQEMUDriverPtr driver,
         goto exit_monitor;
     chardevAdded = true;
 
-    rv = qemuMonitorAddObjectType(priv->mon, type, objAlias, props);
-    props = NULL; /* qemuMonitorAddObjectType consumes */
-    if (rv < 0)
+    if (qemuMonitorAddObject(priv->mon, &props, &objAlias) < 0)
         goto exit_monitor;
-    objAdded = true;
 
     if (qemuMonitorAddDevice(priv->mon, devstr) < 0)
         goto exit_monitor;
@@ -2071,7 +2062,7 @@ qemuDomainAttachRNGDevice(virQEMUDriverPtr driver,
 
  exit_monitor:
     virErrorPreserveLast(&orig_err);
-    if (objAdded)
+    if (objAlias)
         ignore_value(qemuMonitorDelObject(priv->mon, objAlias));
     if (rng->backend == VIR_DOMAIN_RNG_BACKEND_EGD && chardevAdded)
         ignore_value(qemuMonitorDetachCharDev(priv->mon, charAlias));