diff --git a/crypto/drbg.c b/crypto/drbg.c
index cce915b..c9b4c49 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1106,7 +1106,7 @@
 
 	/* 9.1 / 9.2 / 9.3.1 step 3 */
 	if (pers && pers->len > (drbg_max_addtl(drbg))) {
-		pr_devel("DRBG: personalization string too long %lu\n",
+		pr_devel("DRBG: personalization string too long %zu\n",
 			 pers->len);
 		return -EINVAL;
 	}
@@ -1984,7 +1984,7 @@
 
 	if (ARRAY_SIZE(drbg_cores) * 2 > ARRAY_SIZE(drbg_algs)) {
 		pr_info("DRBG: Cannot register all DRBG types"
-			"(slots needed: %lu, slots available: %lu)\n",
+			"(slots needed: %zu, slots available: %zu)\n",
 			ARRAY_SIZE(drbg_cores) * 2, ARRAY_SIZE(drbg_algs));
 		return ret;
 	}