diff --git a/drivers/firmware/imx/sm-misc.c b/drivers/firmware/imx/sm-misc.c
index 0a8ada329c9d..8d95a901734a 100644
--- a/drivers/firmware/imx/sm-misc.c
+++ b/drivers/firmware/imx/sm-misc.c
@@ -16,7 +16,7 @@
 
 static const struct scmi_imx_misc_proto_ops *imx_misc_ctrl_ops;
 static struct scmi_protocol_handle *ph;
-struct notifier_block scmi_imx_misc_ctrl_nb;
+static struct notifier_block scmi_imx_misc_ctrl_nb;
 
 int scmi_imx_misc_ctrl_set(u32 id, u32 val)
 {