diff --git a/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c b/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c
index c635554e288e..2177045ade5f 100644
--- a/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c
+++ b/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c
@@ -856,7 +856,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
 	else if (reqlen == sizeof(struct mlx5_ib_alloc_ucontext_req_v2))
 		ver = 2;
 	else {
-		mlx5_ib_err(dev, "request malformed, reqlen: %ld\n", reqlen);
+		mlx5_ib_err(dev, "request malformed, reqlen: %ld\n", (long)reqlen);
 		return ERR_PTR(-EINVAL);
 	}
 
diff --git a/sys/dev/mlx5/mlx5_ib/mlx5_ib_mem.c b/sys/dev/mlx5/mlx5_ib/mlx5_ib_mem.c
index cc4e21631ae8..f942f8b9e8ce 100644
--- a/sys/dev/mlx5/mlx5_ib/mlx5_ib_mem.c
+++ b/sys/dev/mlx5/mlx5_ib/mlx5_ib_mem.c
@@ -29,6 +29,8 @@
 #include <rdma/ib_umem.h>
 #include "mlx5_ib.h"
 
+CTASSERT(sizeof(uintptr_t) == sizeof(unsigned long));
+
 /* @umem: umem object to scan
  * @addr: ib virtual address requested by the user
  * @count: number of PAGE_SIZE pages covered by umem
@@ -40,7 +42,7 @@
 void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
 			int *ncont, int *order)
 {
-	uintptr_t tmp;
+	unsigned long tmp;
 	unsigned long m;
 	int i, k;
 	u64 base = 0;