diff --git a/src/stdafx.h b/src/stdafx.h
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -428,6 +428,16 @@ static_assert(SIZE_MAX >= UINT32_MAX);
 /* For the FMT library we only want to use the headers, not link to some library. */
 #define FMT_HEADER_ONLY
 
+#if defined(__GNUC__) || defined(__clang__)
+__attribute__((aligned(1))) typedef uint16 unaligned_uint16;
+__attribute__((aligned(1))) typedef uint32 unaligned_uint32;
+__attribute__((aligned(1))) typedef uint64 unaligned_uint64;
+#else
+typedef uint16 unaligned_uint16;
+typedef uint32 unaligned_uint32;
+typedef uint64 unaligned_uint64;
+#endif /* __GNUC__ || __clang__ */
+
 void NORETURN CDECL usererror(const char *str, ...) WARN_FORMAT(1, 2);
 void NORETURN CDECL error(const char *str, ...) WARN_FORMAT(1, 2);
 #define NOT_REACHED() error("NOT_REACHED triggered at line %i of %s", __LINE__, __FILE__)