diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index 909154b73b8a..4caa18afa3a2 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -142,7 +142,7 @@ module_param_named(bs, g_bs, int, 0444);
 MODULE_PARM_DESC(bs, "Block size (in bytes)");
 
 static unsigned int nr_devices = 1;
-module_param(nr_devices, int, 0444);
+module_param(nr_devices, uint, 0444);
 MODULE_PARM_DESC(nr_devices, "Number of devices to register");
 
 static bool g_blocking;