diff --git a/Timer.h b/Timer.h
index b649bf0..0407c79 100644
--- a/Timer.h
+++ b/Timer.h
@@ -20,6 +20,7 @@
 
 #include <time.h>
 #include <string>
+#include <cstdint>
 #ifdef WIN64
 #include <windows.h>
 #endif
diff --git a/hash/sha256.cpp b/hash/sha256.cpp
index 30cde56..fa92dc5 100644
--- a/hash/sha256.cpp
+++ b/hash/sha256.cpp
@@ -16,6 +16,7 @@
 */
 
 #include <string.h>
+#include <cstdint>
 #include "sha256.h"
 
 #define BSWAP
diff --git a/hash/sha256.h b/hash/sha256.h
index 7f106b7..a4476d1 100644
--- a/hash/sha256.h
+++ b/hash/sha256.h
@@ -18,6 +18,7 @@
 #ifndef SHA256_H
 #define SHA256_H
 #include <string>
+#include <cstdint>
 
 void sha256(uint8_t *input,int length, uint8_t *digest);
 void sha256_33(uint8_t *input, uint8_t *digest);
@@ -32,4 +33,4 @@ void sha256sse_checksum(uint32_t *i0, uint32_t *i1, uint32_t *i2, uint32_t *i3,
 std::string sha256_hex(unsigned char *digest);
 void sha256sse_test();
 
-#endif
\ No newline at end of file
+#endif
diff --git a/hash/sha512.cpp b/hash/sha512.cpp
index 2ab9bae..240e438 100644
--- a/hash/sha512.cpp
+++ b/hash/sha512.cpp
@@ -16,6 +16,7 @@
 */
 
 #include <string.h>
+#include <cstdint>
 #include "sha512.h"
 
 #define BSWAP