diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 954dbc105fc8..5852fe290523 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -25,7 +25,7 @@
 
 int nvdimm_major;
 static int nvdimm_bus_major;
-struct class *nd_class;
+static struct class *nd_class;
 static DEFINE_IDA(nd_ida);
 
 static int to_nd_device_type(const struct device *dev)