diff --git a/src/tinyformat.h b/src/tinyformat.h
--- a/src/tinyformat.h
+++ b/src/tinyformat.h
@@ -143,6 +143,7 @@
 //------------------------------------------------------------------------------
 // Implementation details.
 #include <algorithm>
+#include <cstdint>
 #include <iostream>
 #include <sstream>
 #include <stdexcept> // Added for Bitcoin
diff --git a/src/util/bip32.h b/src/util/bip32.h
--- a/src/util/bip32.h
+++ b/src/util/bip32.h
@@ -5,6 +5,7 @@
 #ifndef BITCOIN_UTIL_BIP32_H
 #define BITCOIN_UTIL_BIP32_H
 
+#include <cstdint>
 #include <string>
 #include <vector>