diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 06a59d015f..c0238f57be 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1030,6 +1030,17 @@ qemuGetNextChrDevIndex(virDomainDefPtr def,
 }
 
 
+int
+qemuAssignDeviceRNGAlias(virDomainRNGDefPtr rng,
+                         size_t idx)
+{
+    if (virAsprintf(&rng->info.alias, "rng%zu", idx) < 0)
+        return -1;
+
+    return 0;
+}
+
+
 int
 qemuAssignDeviceChrAlias(virDomainDefPtr def,
                          virDomainChrDefPtr chr,
@@ -1155,7 +1166,7 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
             return -1;
     }
     for (i = 0; i < def->nrngs; i++) {
-        if (virAsprintf(&def->rngs[i]->info.alias, "rng%zu", i) < 0)
+        if (qemuAssignDeviceRNGAlias(def->rngs[i], i) < 0)
             return -1;
     }
     if (def->tpm) {
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index ae36bd8d2c..d8fea659ba 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -269,6 +269,7 @@ int qemuAssignDeviceRedirdevAlias(virDomainDefPtr def, virDomainRedirdevDefPtr r
 int qemuAssignDeviceChrAlias(virDomainDefPtr def,
                              virDomainChrDefPtr chr,
                              ssize_t idx);
+int qemuAssignDeviceRNGAlias(virDomainRNGDefPtr rng, size_t idx);
 
 int
 qemuParseKeywords(const char *str,