diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 3d729099e9..6d1389af87 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -643,6 +643,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               /* 410 */
               "virtio-mem-pci", /* QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI */
               "memory-backend-file.reserve", /* QEMU_CAPS_MEMORY_BACKEND_RESERVE */
+              "piix4-acpi-root-hotplug-en", /* QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG */
     );
 
 
@@ -1470,6 +1471,7 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsIDEDrive[] = {
 static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsPiix4PM[] = {
     { "disable_s3", QEMU_CAPS_PIIX_DISABLE_S3, NULL },
     { "disable_s4", QEMU_CAPS_PIIX_DISABLE_S4, NULL },
+    { "acpi-root-pci-hotplug", QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG, NULL },
 };
 
 static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsUSBRedir[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 6d544e92c4..867c94cb3d 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -623,6 +623,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     /* 410 */
     QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI, /* -device virtio-mem-pci */
     QEMU_CAPS_MEMORY_BACKEND_RESERVE, /* -object memory-backend-*.reserve= */
+    QEMU_CAPS_PIIX_ACPI_ROOT_PCI_HOTPLUG, /* -M pc PIIX4_PM.acpi-root-pci-hotplug */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
index f597f52771..79d36bf19f 100644
--- a/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml
@@ -231,6 +231,7 @@
   <flag name='query-display-options'/>
   <flag name='virtio-blk.queue-size'/>
   <flag name='virtio-mem-pci'/>
+  <flag name='piix4-acpi-root-hotplug-en'/>
   <version>5002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
index dde3ba17e8..0d8edef6a1 100644
--- a/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.0.0.x86_64.xml
@@ -239,6 +239,7 @@
   <flag name='set-action'/>
   <flag name='virtio-blk.queue-size'/>
   <flag name='virtio-mem-pci'/>
+  <flag name='piix4-acpi-root-hotplug-en'/>
   <version>6000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
index 518c0cea77..7ba3b328ca 100644
--- a/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_6.1.0.x86_64.xml
@@ -242,6 +242,7 @@
   <flag name='virtio-blk.queue-size'/>
   <flag name='virtio-mem-pci'/>
   <flag name='memory-backend-file.reserve'/>
+  <flag name='piix4-acpi-root-hotplug-en'/>
   <version>6001000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>