diff --git a/qdev-monitor.c b/qdev-monitor.c
index fb9ee24..5ec6606 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -206,7 +206,7 @@
     }
 
     prop_list = qmp_device_list_properties(driver, &local_err);
-    if (!prop_list) {
+    if (local_err) {
         error_printf("%s\n", error_get_pretty(local_err));
         error_free(local_err);
         return 1;