diff --git a/s/i3nt.def b/s/i3nt.def
index 31f786b28c..1da39fa80c 100644
--- a/s/i3nt.def
+++ b/s/i3nt.def
@@ -38,8 +38,8 @@
 (define-constant typedef-u16 "unsigned short")
 (define-constant typedef-i32 "int")
 (define-constant typedef-u32 "unsigned int")
-(define-constant typedef-i64 "__int64")
-(define-constant typedef-u64 "unsigned __int64")
+(define-constant typedef-i64 "long long")
+(define-constant typedef-u64 "unsigned long long")
 (define-constant typedef-string-char "unsigned int")
 (define-constant thread-handle-uptrs 1)
 (define-constant native-endianness 'little)