diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3c84246d21..37cacffcdb 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -303,6 +303,8 @@ qemuBuildDeviceAddressStr(virBufferPtr buf,
     int ret = -1;
     char *devStr = NULL;
     const char *contAlias = NULL;
+    bool contIsPHB = false;
+    int contTargetIndex = 0;
 
     if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
         size_t i;
@@ -315,6 +317,8 @@ qemuBuildDeviceAddressStr(virBufferPtr buf,
             if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_PCI &&
                 cont->idx == info->addr.pci.bus) {
                 contAlias = cont->info.alias;
+                contIsPHB = virDomainControllerIsPCIHostBridge(cont);
+                contTargetIndex = cont->opts.pciopts.targetIndex;
                 if (!contAlias) {
                     virReportError(VIR_ERR_INTERNAL_ERROR,
                                    _("Device alias was not set for PCI "
@@ -350,7 +354,17 @@ qemuBuildDeviceAddressStr(virBufferPtr buf,
             }
         }
 
-        virBufferAsprintf(buf, ",bus=%s", contAlias);
+        if (contIsPHB && contTargetIndex > 0) {
+            /* The PCI bus created by a spapr-pci-host-bridge device with
+             * alias 'x' will be called 'x.0' rather than 'x'; however,
+             * this does not apply to the implicit PHB in a pSeries guest,
+             * which always has the hardcoded name 'pci.0' */
+            virBufferAsprintf(buf, ",bus=%s.0", contAlias);
+        } else {
+            /* For all other controllers, the bus name matches the alias
+             * of the corresponding controller */
+            virBufferAsprintf(buf, ",bus=%s", contAlias);
+        }
 
         if (info->addr.pci.multi == VIR_TRISTATE_SWITCH_ON)
             virBufferAddLit(buf, ",multifunction=on");