diff --git a/src/helpers.c b/src/helpers.c
index 0007f20..5539448 100644
--- a/src/helpers.c
+++ b/src/helpers.c
@@ -20,14 +20,14 @@
 
 int simple_archiver_helper_is_big_endian(void) {
   union {
-    unsigned int i;
+    uint32_t i;
     char c[4];
   } bint = {0x01020304};
 
   return bint.c[0] == 1 ? 1 : 0;
 }
 
-void simple_archiver_helper_16_bit_be(unsigned short *value) {
+void simple_archiver_helper_16_bit_be(uint16_t *value) {
   if (simple_archiver_helper_is_big_endian() == 0) {
     unsigned char c = ((unsigned char *)value)[0];
     ((unsigned char *)value)[0] = ((unsigned char *)value)[1];
@@ -35,7 +35,7 @@ void simple_archiver_helper_16_bit_be(unsigned short *value) {
   }
 }
 
-void simple_archiver_helper_32_bit_be(unsigned int *value) {
+void simple_archiver_helper_32_bit_be(uint32_t *value) {
   if (simple_archiver_helper_is_big_endian() == 0) {
     for (unsigned int i = 0; i < 2; ++i) {
       unsigned char c = ((unsigned char *)value)[i];
@@ -45,7 +45,7 @@ void simple_archiver_helper_32_bit_be(unsigned int *value) {
   }
 }
 
-void simple_archiver_helper_64_bit_be(unsigned long long *value) {
+void simple_archiver_helper_64_bit_be(uint64_t *value) {
   if (simple_archiver_helper_is_big_endian() == 0) {
     for (unsigned int i = 0; i < 4; ++i) {
       unsigned char c = ((unsigned char *)value)[i];
diff --git a/src/helpers.h b/src/helpers.h
index f5915fd..cb4c040 100644
--- a/src/helpers.h
+++ b/src/helpers.h
@@ -19,18 +19,20 @@
 #ifndef SEODISPARATE_COM_SIMPLE_ARCHIVER_HELPERS_H_
 #define SEODISPARATE_COM_SIMPLE_ARCHIVER_HELPERS_H_
 
+#include <stdint.h>
+
 static const unsigned int MAX_SYMBOLIC_LINK_SIZE = 512;
 
 /// Returns non-zero if this system is big-endian.
 int simple_archiver_helper_is_big_endian(void);
 
 /// Swaps value from/to big-endian. Nop on big-endian systems.
-void simple_archiver_helper_16_bit_be(unsigned short *value);
+void simple_archiver_helper_16_bit_be(uint16_t *value);
 
 /// Swaps value from/to big-endian. Nop on big-endian systems.
-void simple_archiver_helper_32_bit_be(unsigned int *value);
+void simple_archiver_helper_32_bit_be(uint32_t *value);
 
 /// Swaps value from/to big-endian. Nop on big-endian systems.
-void simple_archiver_helper_64_bit_be(unsigned long long *value);
+void simple_archiver_helper_64_bit_be(uint64_t *value);
 
 #endif
diff --git a/src/test.c b/src/test.c
index 7f07097..6d1dfdb 100644
--- a/src/test.c
+++ b/src/test.c
@@ -114,7 +114,7 @@ int main(void) {
   {
     // Only if system is little-endian.
     if (simple_archiver_helper_is_big_endian() == 0) {
-      unsigned short u16 = 0x0102;
+      uint16_t u16 = 0x0102;
       CHECK_TRUE(((unsigned char *)&u16)[0] == 2);
       CHECK_TRUE(((unsigned char *)&u16)[1] == 1);
       simple_archiver_helper_16_bit_be(&u16);
@@ -124,7 +124,7 @@ int main(void) {
       CHECK_TRUE(((unsigned char *)&u16)[0] == 2);
       CHECK_TRUE(((unsigned char *)&u16)[1] == 1);
 
-      unsigned int u32 = 0x01020304;
+      uint32_t u32 = 0x01020304;
       CHECK_TRUE(((unsigned char *)&u32)[0] == 4);
       CHECK_TRUE(((unsigned char *)&u32)[1] == 3);
       CHECK_TRUE(((unsigned char *)&u32)[2] == 2);
@@ -140,7 +140,7 @@ int main(void) {
       CHECK_TRUE(((unsigned char *)&u32)[2] == 2);
       CHECK_TRUE(((unsigned char *)&u32)[3] == 1);
 
-      unsigned long long u64 = 0x010203040a0b0c0d;
+      uint64_t u64 = 0x010203040a0b0c0d;
       CHECK_TRUE(((unsigned char *)&u64)[0] == 0xd);
       CHECK_TRUE(((unsigned char *)&u64)[1] == 0xc);
       CHECK_TRUE(((unsigned char *)&u64)[2] == 0xb);