diff --git a/32/base14.c b/32/base14.c
index 013aa5e..f9e8871 100644
--- a/32/base14.c
+++ b/32/base14.c
@@ -6,7 +6,7 @@
 
 //#define DEBUG
 
-LENDAT* encode(const uint8_t* data, const u_int32_t len) {
+LENDAT* encode(const uint8_t* data, const uint32_t len) {
 	LENDAT* encd = (LENDAT*)malloc(sizeof(LENDAT));
 	uint32_t outlen = len / 7 * 8;
 	uint8_t offset = len % 7;
@@ -85,7 +85,7 @@ LENDAT* encode(const uint8_t* data, const u_int32_t len) {
 	return encd;
 }
 
-LENDAT* decode(const uint8_t* data, const u_int32_t len) {
+LENDAT* decode(const uint8_t* data, const uint32_t len) {
 	LENDAT* decd = (LENDAT*)malloc(sizeof(LENDAT));
 	uint32_t outlen = len;
 	uint8_t offset = 0;
diff --git a/32/base14.h b/32/base14.h
index c946b24..cfbdecb 100644
--- a/32/base14.h
+++ b/32/base14.h
@@ -9,5 +9,5 @@ struct LENDAT {
 };
 typedef struct LENDAT LENDAT;
 
-LENDAT* encode(const uint8_t* data, const u_int32_t len);
-LENDAT* decode(const uint8_t* data, const u_int32_t len);
+LENDAT* encode(const uint8_t* data, const uint32_t len);
+LENDAT* decode(const uint8_t* data, const uint32_t len);
diff --git a/64/base14.c b/64/base14.c
index c6d016c..3d67bbf 100644
--- a/64/base14.c
+++ b/64/base14.c
@@ -6,7 +6,7 @@
 
 //#define DEBUG
 
-LENDAT* encode(const uint8_t* data, const u_int64_t len) {
+LENDAT* encode(const uint8_t* data, const uint64_t len) {
 	LENDAT* encd = (LENDAT*)malloc(sizeof(LENDAT));
 	uint64_t outlen = len / 7 * 8;
 	uint8_t offset = len % 7;
@@ -77,7 +77,7 @@ LENDAT* encode(const uint8_t* data, const u_int64_t len) {
 	return encd;
 }
 
-LENDAT* decode(const uint8_t* data, const u_int64_t len) {
+LENDAT* decode(const uint8_t* data, const uint64_t len) {
 	LENDAT* decd = (LENDAT*)malloc(sizeof(LENDAT));
 	uint64_t outlen = len;
 	uint8_t offset = 0;
diff --git a/64/base14.h b/64/base14.h
index ff08fb8..b8dc4cd 100644
--- a/64/base14.h
+++ b/64/base14.h
@@ -9,5 +9,5 @@ struct LENDAT {
 };
 typedef struct LENDAT LENDAT;
 
-LENDAT* encode(const uint8_t* data, const u_int64_t len);
-LENDAT* decode(const uint8_t* data, const u_int64_t len);
+LENDAT* encode(const uint8_t* data, const uint64_t len);
+LENDAT* decode(const uint8_t* data, const uint64_t len);