diff --git a/qerror.c b/qerror.c
index 75f7b58465e4069fdd0e874f6f82c370d3732b0a..c14ec80b8177d058b0d11e6258104598ff80a1ad 100644
--- a/qerror.c
+++ b/qerror.c
@@ -56,6 +56,10 @@ static const QErrorStringTable qerror_table[] = {
         .error_fmt = QERR_DEVICE_LOCKED,
         .desc      = "Device '%(device)' is locked",
     },
+    {
+        .error_fmt = QERR_DEVICE_MULTIPLE_BUSSES,
+        .desc      = "Device '%(device)' has multiple child busses",
+    },
     {
         .error_fmt = QERR_DEVICE_NOT_ACTIVE,
         .desc      = "Device '%(device)' has not been activated by the guest",
diff --git a/qerror.h b/qerror.h
index 84928080fc7f371eae635d2ee7ab9afa83fd8dd6..27e69b1f312b7e46a6e308796e29f9466e3dfebc 100644
--- a/qerror.h
+++ b/qerror.h
@@ -54,6 +54,9 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_DEVICE_LOCKED \
     "{ 'class': 'DeviceLocked', 'data': { 'device': %s } }"
 
+#define QERR_DEVICE_MULTIPLE_BUSSES \
+    "{ 'class': 'DeviceMultipleBusses', 'data': { 'device': %s } }"
+
 #define QERR_DEVICE_NOT_ACTIVE \
     "{ 'class': 'DeviceNotActive', 'data': { 'device': %s } }"