diff --git a/Activity/Observer.hpp b/Activity/Observer.hpp
index 307b404be..4233af7d7 100644
--- a/Activity/Observer.hpp
+++ b/Activity/Observer.hpp
@@ -9,6 +9,7 @@
 #ifndef ActivityObserver_h
 #define ActivityObserver_h
 
+#include <cstdint>
 #include <string>
 
 namespace Activity {
diff --git a/Analyser/Static/Commodore/File.hpp b/Analyser/Static/Commodore/File.hpp
index 61b4a9b10..01c85824b 100644
--- a/Analyser/Static/Commodore/File.hpp
+++ b/Analyser/Static/Commodore/File.hpp
@@ -9,6 +9,7 @@
 #ifndef File_hpp
 #define File_hpp
 
+#include <cstdint>
 #include <string>
 #include <vector>
 
diff --git a/Machines/Utility/ROMCatalogue.hpp b/Machines/Utility/ROMCatalogue.hpp
index 475bab65d..2580ad70c 100644
--- a/Machines/Utility/ROMCatalogue.hpp
+++ b/Machines/Utility/ROMCatalogue.hpp
@@ -10,6 +10,7 @@
 #define ROMCatalogue_hpp
 
 #include <algorithm>
+#include <cstdint>
 #include <functional>
 #include <map>
 #include <optional>
diff --git a/Machines/Utility/StringSerialiser.hpp b/Machines/Utility/StringSerialiser.hpp
index 87c2d8e26..4e194e680 100644
--- a/Machines/Utility/StringSerialiser.hpp
+++ b/Machines/Utility/StringSerialiser.hpp
@@ -9,6 +9,7 @@
 #ifndef StringSerialiser_hpp
 #define StringSerialiser_hpp
 
+#include <cstdint>
 #include <string>
 
 namespace Utility {
diff --git a/Reflection/Struct.hpp b/Reflection/Struct.hpp
index 464860ade..c3be36f89 100644
--- a/Reflection/Struct.hpp
+++ b/Reflection/Struct.hpp
@@ -13,6 +13,7 @@
 #include <cstdarg>
 #include <cstring>
 #include <cstddef>
+#include <cstdint>
 #include <string>
 #include <typeindex>
 #include <typeinfo>
diff --git a/Storage/Data/Commodore.hpp b/Storage/Data/Commodore.hpp
index 383fd2391..4e8102640 100644
--- a/Storage/Data/Commodore.hpp
+++ b/Storage/Data/Commodore.hpp
@@ -9,6 +9,7 @@
 #ifndef Storage_Data_Commodore_hpp
 #define Storage_Data_Commodore_hpp
 
+#include <cstdint>
 #include <string>
 
 namespace Storage::Data::Commodore {