diff --git a/src/npyffi/types.rs b/src/npyffi/types.rs
index 68df9c52f..eb03b801b 100644
--- a/src/npyffi/types.rs
+++ b/src/npyffi/types.rs
@@ -19,15 +19,15 @@ pub type npy_long = c_long;
 pub type npy_float = f32;
 pub type npy_double = f64;
 pub type npy_hash_t = Py_hash_t;
-pub type npy_int64 = c_long;
-pub type npy_uint64 = c_ulong;
-pub type npy_int32 = c_int;
-pub type npy_uint32 = c_uint;
+pub type npy_int64 = i64;
+pub type npy_uint64 = u64;
+pub type npy_int32 = i32;
+pub type npy_uint32 = u32;
 pub type npy_ucs4 = c_uint;
-pub type npy_int16 = c_short;
-pub type npy_uint16 = c_ushort;
-pub type npy_int8 = c_char;
-pub type npy_uint8 = c_uchar;
+pub type npy_int16 = i16;
+pub type npy_uint16 = u16;
+pub type npy_int8 = i8;
+pub type npy_uint8 = u8;
 pub type npy_float64 = f64;
 pub type npy_complex128 = npy_cdouble;
 pub type npy_float32 = f32;