diff --git a/src/libcore/ctypes.rs b/src/libcore/ctypes.rs
index d26b183a2f38d..b9d42275824df 100644
--- a/src/libcore/ctypes.rs
+++ b/src/libcore/ctypes.rs
@@ -32,6 +32,13 @@ A signed integer with the same size as a C `long`
 */
 type long = int;
 
+/*
+Type: longlong
+
+A signed integer with the same size as a C `long long`
+*/
+type longlong = i64;
+
 /*
 Type: unsigned
 
@@ -46,6 +53,13 @@ An unsigned integer with the same size as a C `unsigned long`
 */
 type ulong = uint;
 
+/*
+Type: ulonglong
+
+An unsigned integer with the same size as a C `unsigned long long`
+*/
+type ulonglong = u64;
+
 /*
 Type: intptr_t