diff --git a/src/openrct2/ReplayManager.h b/src/openrct2/ReplayManager.h
index c2286bf62f..d3f3a98bc0 100644
--- a/src/openrct2/ReplayManager.h
+++ b/src/openrct2/ReplayManager.h
@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
 #include <set>
 #include <string>
diff --git a/src/openrct2/audio/AudioMixer.h b/src/openrct2/audio/AudioMixer.h
index f59d87adef..0c09d99c4e 100644
--- a/src/openrct2/audio/AudioMixer.h
+++ b/src/openrct2/audio/AudioMixer.h
@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
 
 namespace OpenRCT2::Audio
diff --git a/src/openrct2/core/Crypt.h b/src/openrct2/core/Crypt.h
index 8694683c3e..d6f02e76e3 100644
--- a/src/openrct2/core/Crypt.h
+++ b/src/openrct2/core/Crypt.h
@@ -10,6 +10,7 @@
 #pragma once
 
 #include <array>
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <string_view>
diff --git a/src/openrct2/core/Zip.h b/src/openrct2/core/Zip.h
index b8c3c656ca..d1c811bc67 100644
--- a/src/openrct2/core/Zip.h
+++ b/src/openrct2/core/Zip.h
@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <istream>
 #include <memory>
 #include <optional>
diff --git a/src/openrct2/network/NetworkKey.h b/src/openrct2/network/NetworkKey.h
index 3e329882c7..f46224bce4 100644
--- a/src/openrct2/network/NetworkKey.h
+++ b/src/openrct2/network/NetworkKey.h
@@ -11,6 +11,7 @@
 
 #ifndef DISABLE_NETWORK
 
+    #include <cstdint>
     #include <memory>
     #include <string>
     #include <vector>
diff --git a/src/openrct2/network/NetworkServerAdvertiser.h b/src/openrct2/network/NetworkServerAdvertiser.h
index 7738df9b34..1b48717e61 100644
--- a/src/openrct2/network/NetworkServerAdvertiser.h
+++ b/src/openrct2/network/NetworkServerAdvertiser.h
@@ -9,6 +9,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
 
 namespace OpenRCT2::Network