diff --git a/radiantcore/model/import/openfbx/ofbx.h b/radiantcore/model/import/openfbx/ofbx.h
index ccf967f970..dbf94d4b20 100644
--- a/radiantcore/model/import/openfbx/ofbx.h
+++ b/radiantcore/model/import/openfbx/ofbx.h
@@ -1,27 +1,22 @@
 #pragma once
 
+#include <cstdint>
 
 namespace ofbx
 {
 
 
-typedef unsigned char u8;
-typedef unsigned short u16;
-typedef unsigned int u32;
-#ifdef _WIN32
-	typedef long long i64;
-	typedef unsigned long long u64;
-#else
-	typedef long i64;
-	typedef unsigned long u64;
-#endif
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef int64_t i64;
+typedef uint64_t u64;
 
 static_assert(sizeof(u8) == 1, "u8 is not 1 byte");
 static_assert(sizeof(u32) == 4, "u32 is not 4 bytes");
 static_assert(sizeof(u64) == 8, "u64 is not 8 bytes");
 static_assert(sizeof(i64) == 8, "i64 is not 8 bytes");
 
-
 using JobFunction = void (*)(void*);
 using JobProcessor = void (*)(JobFunction, void*, void*, u32, u32);