diff --git a/sys/dev/nvd/nvd.c b/sys/dev/nvd/nvd.c
index e8fd115ec834..879f30e6135f 100644
--- a/sys/dev/nvd/nvd.c
+++ b/sys/dev/nvd/nvd.c
@@ -147,7 +147,7 @@ MODULE_VERSION(nvd, 1);
 MODULE_DEPEND(nvd, nvme, 1, 1, 1);
 
 static int
-nvd_load()
+nvd_load(void)
 {
 	if (!nvme_use_nvd)
 		return 0;
@@ -163,7 +163,7 @@ nvd_load()
 }
 
 static void
-nvd_unload()
+nvd_unload(void)
 {
 	struct nvd_controller	*ctrlr;
 	struct nvd_disk		*ndisk;