diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 877269f52ed57bea7e628597d3a821ed6b409239..4e2cd496849ce1789f7230d212d3ba712658d1d2 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4096,7 +4096,9 @@ qemuBuildVirtioInputDevStr(const virDomainDef *def,
         virQEMUBuildBufferEscapeComma(&buf, dev->source.evdev);
         break;
     case VIR_DOMAIN_INPUT_TYPE_LAST:
-        break;
+    default:
+        virReportEnumRangeError(virDomainInputType, dev->type);
+        goto error;
     }
 
     if (qemuBuildDeviceAddressStr(&buf, def, &dev->info, qemuCaps) < 0)