diff --git a/blockdev.c b/blockdev.c
index 44755e1a5d..6a85961af2 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1523,7 +1523,7 @@ static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
 }
 
 void qmp_change_blockdev(const char *device, const char *filename,
-                         bool has_format, const char *format, Error **errp)
+                         const char *format, Error **errp)
 {
     BlockDriverState *bs;
     BlockDriver *drv = NULL;
diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
index 10820910d7..134712b500 100644
--- a/include/sysemu/blockdev.h
+++ b/include/sysemu/blockdev.h
@@ -64,7 +64,7 @@ DriveInfo *drive_init(QemuOpts *arg, BlockInterfaceType block_default_type);
 DriveInfo *add_init_drive(const char *opts);
 
 void qmp_change_blockdev(const char *device, const char *filename,
-                         bool has_format, const char *format, Error **errp);
+                         const char *format, Error **errp);
 void do_commit(Monitor *mon, const QDict *qdict);
 int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
 #endif
diff --git a/qmp.c b/qmp.c
index 4c149b33a4..1d7a04d7a0 100644
--- a/qmp.c
+++ b/qmp.c
@@ -400,7 +400,7 @@ void qmp_change(const char *device, const char *target,
     if (strcmp(device, "vnc") == 0) {
         qmp_change_vnc(target, has_arg, arg, err);
     } else {
-        qmp_change_blockdev(device, target, has_arg, arg, err);
+        qmp_change_blockdev(device, target, arg, err);
     }
 }