--- FreeImage/Source/Utilities.h	Mon Apr 11 15:15:32 2016
+++ FreeImage/Source/Utilities_.h	Tue May 24 10:50:11 2022
@@ -446,12 +446,12 @@
 }
  
 inline void
-SwapInt64(UINT64 *arg) {
+SwapInt64(uint64_t *arg) {
 #if defined(_MSC_VER) && _MSC_VER >= 1310
 	*arg = _byteswap_uint64(*arg);
 #else
 	union Swap {
-		UINT64 sv;
+		uint64_t sv;
 		DWORD ul[2];
 	} tmp, result;
 	tmp.sv = *arg;