diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 100600e2d6..89313dff1a 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2707,7 +2707,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                                        QEMU_MIGRATION_COOKIE_NBD)))
         goto cleanup;
 
-    if (STREQ(protocol, "rdma") && !vm->def->mem.hard_limit) {
+    if (STREQ_NULLABLE(protocol, "rdma") && !vm->def->mem.hard_limit) {
         virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                        _("cannot start RDMA migration with no memory hard "
                          "limit set"));