diff --git a/module/bdev/nvme/bdev_nvme.c b/module/bdev/nvme/bdev_nvme.c
index 40baf51bf..573f68d5d 100644
--- a/module/bdev/nvme/bdev_nvme.c
+++ b/module/bdev/nvme/bdev_nvme.c
@@ -1218,7 +1218,7 @@ bdev_nvme_create_bdevs(struct nvme_async_probe_ctx *ctx)
 			ctx->names[j] = nvme_bdev->disk.name;
 			j++;
 		} else {
-			SPDK_ERRLOG("Maximum number of namespaces supported per NVMe controller is %zu. Unable to return all names of created bdevs\n",
+			SPDK_ERRLOG("Maximum number of namespaces supported per NVMe controller is %du. Unable to return all names of created bdevs\n",
 				    *ctx->count);
 			return -1;
 		}
@@ -1278,7 +1278,8 @@ int
 spdk_bdev_nvme_create(struct spdk_nvme_transport_id *trid,
 		      struct spdk_nvme_host_id *hostid,
 		      const char *base_name,
-		      const char **names, size_t *count,
+		      const char **names,
+		      uint32_t *count,
 		      const char *hostnqn,
 		      uint32_t prchk_flags,
 		      spdk_bdev_create_nvme_fn cb_fn,
diff --git a/module/bdev/nvme/bdev_nvme.h b/module/bdev/nvme/bdev_nvme.h
index 23f65eb89..490408449 100644
--- a/module/bdev/nvme/bdev_nvme.h
+++ b/module/bdev/nvme/bdev_nvme.h
@@ -69,7 +69,8 @@ int spdk_bdev_nvme_set_hotplug(bool enabled, uint64_t period_us, spdk_msg_fn cb,
 int spdk_bdev_nvme_create(struct spdk_nvme_transport_id *trid,
 			  struct spdk_nvme_host_id *hostid,
 			  const char *base_name,
-			  const char **names, size_t *count,
+			  const char **names,
+			  uint32_t *count,
 			  const char *hostnqn,
 			  uint32_t prchk_flags,
 			  spdk_bdev_create_nvme_fn cb_fn,
diff --git a/module/bdev/nvme/bdev_nvme_rpc.c b/module/bdev/nvme/bdev_nvme_rpc.c
index 2adfb4750..409e52dae 100644
--- a/module/bdev/nvme/bdev_nvme_rpc.c
+++ b/module/bdev/nvme/bdev_nvme_rpc.c
@@ -210,7 +210,7 @@ static const struct spdk_json_object_decoder rpc_bdev_nvme_attach_controller_dec
 
 struct rpc_bdev_nvme_attach_controller_ctx {
 	struct rpc_bdev_nvme_attach_controller req;
-	size_t count;
+	uint32_t count;
 	const char *names[NVME_MAX_BDEVS_PER_RPC];
 	struct spdk_jsonrpc_request *request;
 };
diff --git a/module/bdev/nvme/common.h b/module/bdev/nvme/common.h
index 4c9402929..7fcf134b6 100644
--- a/module/bdev/nvme/common.h
+++ b/module/bdev/nvme/common.h
@@ -87,7 +87,7 @@ struct nvme_async_probe_ctx {
 	struct spdk_nvme_probe_ctx *probe_ctx;
 	const char *base_name;
 	const char **names;
-	size_t *count;
+	uint32_t *count;
 	uint32_t prchk_flags;
 	struct spdk_poller *poller;
 	struct spdk_nvme_transport_id trid;