diff --git a/src/lib.rs b/src/lib.rs
index 8526767..2b1a158 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -25,23 +25,24 @@ pub fn mix32_inv(mut n: u32) -> u32 {
 /// 64-bit bijective bit mixer.
 ///
 /// http://zimbry.blogspot.ch/2011/09/better-bit-mixing-improving-on.html
+/// (variant "Mix13")
 pub fn mix64(mut n: u64) -> u64 {
-    n ^= n >> 31;
-    n = n.wrapping_mul(0x7fb5d329728ea185);
+    n ^= n >> 30;
+    n = n.wrapping_mul(0xbf58476d1ce4e5b9);
     n ^= n >> 27;
-    n = n.wrapping_mul(0x81dadef4bc2dd44d);
-    n ^= n >> 33;
+    n = n.wrapping_mul(0x94d049bb133111eb);
+    n ^= n >> 31;
 
     n
 }
 
 /// Inverse of `mix64()`.
 pub fn mix64_inv(mut n: u64) -> u64 {
-    n ^= n >> 33;
-    n = n.wrapping_mul(0x4d6dff26c61d8485);
-    n ^= (n >> 27) ^ (n >> 54);
-    n = n.wrapping_mul(0x4c5ff4596f4a2f4d);
     n ^= (n >> 31) ^ (n >> 62);
+    n = n.wrapping_mul(0x319642b2d24d8ec3);
+    n ^= (n >> 27) ^ (n >> 54);
+    n = n.wrapping_mul(0x96de1b173f119089);
+    n ^= (n >> 30) ^ (n >> 60);
 
     n
 }
@@ -77,8 +78,10 @@ mod tests {
     // #[test]
     // fn get_inverse() {
     //     // Panic, to print the result.
-    //     panic!("0x{:x}", compute_multiplicative_inverse_32(0x21f0aaad));
-    //     panic!("0x{:x}", compute_multiplicative_inverse_32(0xd35a2d97));
+    //     panic!(
+    //         "0x{:x}",
+    //         compute_multiplicative_inverse_64(0x94d049bb133111eb)
+    //     );
     // }
 
     #[test]