diff --git a/nvme.c b/nvme.c
index 46a2399aa7..5409ddf266 100644
--- a/nvme.c
+++ b/nvme.c
@@ -34,6 +34,7 @@
 #include <inttypes.h>
 #include <locale.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -9081,8 +9082,8 @@ static int check_dhchap_key(int argc, char **argv, struct command *command, stru
 
 	unsigned char decoded_key[128];
 	unsigned int decoded_len;
-	u_int32_t crc = crc32(0L, NULL, 0);
-	u_int32_t key_crc;
+	uint32_t crc = crc32(0L, NULL, 0);
+	uint32_t key_crc;
 	int err = 0, hmac;
 	struct config {
 		char	*key;
@@ -9150,10 +9151,10 @@ static int check_dhchap_key(int argc, char **argv, struct command *command, stru
 		return -EINVAL;
 	}
 	crc = crc32(crc, decoded_key, decoded_len);
-	key_crc = ((u_int32_t)decoded_key[decoded_len]) |
-		   ((u_int32_t)decoded_key[decoded_len + 1] << 8) |
-		   ((u_int32_t)decoded_key[decoded_len + 2] << 16) |
-		   ((u_int32_t)decoded_key[decoded_len + 3] << 24);
+	key_crc = ((uint32_t)decoded_key[decoded_len]) |
+		   ((uint32_t)decoded_key[decoded_len + 1] << 8) |
+		   ((uint32_t)decoded_key[decoded_len + 2] << 16) |
+		   ((uint32_t)decoded_key[decoded_len + 3] << 24);
 	if (key_crc != crc) {
 		nvme_show_error("CRC mismatch (key %08x, crc %08x)", key_crc, crc);
 		return -EINVAL;
diff --git a/util/base64.c b/util/base64.c
index 7f47cda6c3..0e89f2e9df 100644
--- a/util/base64.c
+++ b/util/base64.c
@@ -20,6 +20,7 @@
  * MA  02110-1301, USA.
  */
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
@@ -42,7 +43,7 @@ static const char base64_table[65] =
 int base64_encode(const unsigned char *src, int srclen, char *dst)
 {
 	int i, bits = 0;
-	u_int32_t ac = 0;
+	uint32_t ac = 0;
 	char *cp = dst;
 
 	for (i = 0; i < srclen; i++) {
@@ -77,7 +78,7 @@ int base64_encode(const unsigned char *src, int srclen, char *dst)
  */
 int base64_decode(const char *src, int srclen, unsigned char *dst)
 {
-	u_int32_t ac = 0;
+	uint32_t ac = 0;
 	int i, bits = 0;
 	unsigned char *bp = dst;