diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h
index 5502e112c810..89ed579f5593 100644
--- a/include/qemu/qemu-plugin.h
+++ b/include/qemu/qemu-plugin.h
@@ -331,7 +331,7 @@ struct qemu_plugin_hwaddr *qemu_plugin_get_hwaddr(qemu_plugin_meminfo_t info,
  * to return information about it. For non-IO accesses the device
  * offset will be into the appropriate block of RAM.
  */
-bool qemu_plugin_hwaddr_is_io(struct qemu_plugin_hwaddr *hwaddr);
+bool qemu_plugin_hwaddr_is_io(const struct qemu_plugin_hwaddr *haddr);
 uint64_t qemu_plugin_hwaddr_device_offset(const struct qemu_plugin_hwaddr *haddr);
 
 typedef void
diff --git a/plugins/api.c b/plugins/api.c
index 53c8a7358231..bbdc5a4eb46d 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -275,10 +275,10 @@ struct qemu_plugin_hwaddr *qemu_plugin_get_hwaddr(qemu_plugin_meminfo_t info,
 }
 #endif
 
-bool qemu_plugin_hwaddr_is_io(struct qemu_plugin_hwaddr *hwaddr)
+bool qemu_plugin_hwaddr_is_io(const struct qemu_plugin_hwaddr *haddr)
 {
 #ifdef CONFIG_SOFTMMU
-    return hwaddr->is_io;
+    return haddr->is_io;
 #else
     return false;
 #endif