diff --git a/hmp.c b/hmp.c
index b47f331..7690323 100644
--- a/hmp.c
+++ b/hmp.c
@@ -411,7 +411,7 @@
 
     /* Print BlockBackend information */
     if (!nodes) {
-        block_list = qmp_query_block(false);
+        block_list = qmp_query_block(NULL);
     } else {
         block_list = NULL;
     }