diff --git a/src/test.rs b/src/test.rs
index f1fa4f3..fa8691c 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -1,4 +1,4 @@
-use std::{mem, panic};
+use std::panic;
 
 use quickcheck::TestResult;
 
@@ -27,31 +27,30 @@ absv_i2!(__absvdi2: i64);
 // absv_i2!(__absvti2: i128);
 
 quickcheck! {
-    fn udivmoddi4(a: (u32, u32), b: (u32, u32)) -> TestResult {
-        let (a, b) = unsafe {
-            (mem::transmute(a), mem::transmute(b))
-        };
+    fn udivmoddi4(n: (u32, u32), d: (u32, u32)) -> TestResult {
+        let n = ::U64 { low: n.0, high: n.1 }[..];
+        let d = ::U64 { low: d.0, high: d.1 }[..];
 
-        if b == 0 {
+        if d == 0 {
             TestResult::discard()
         } else {
             let mut r = 0;
-            let q = ::div::__udivmoddi4(a, b, Some(&mut r));
+            let q = ::div::__udivmoddi4(n, d, Some(&mut r));
 
-            TestResult::from_bool(q * b + r == a)
+            TestResult::from_bool(q * d + r == n)
         }
     }
 }
 
 quickcheck! {
-    fn udivmodsi4(a: u32, b: u32) -> TestResult {
-        if b == 0 {
+    fn udivmodsi4(n: u32, d: u32) -> TestResult {
+        if d == 0 {
             TestResult::discard()
         } else {
             let mut r = 0;
-            let q = ::div::__udivmodsi4(a, b, Some(&mut r));
+            let q = ::div::__udivmodsi4(n, d, Some(&mut r));
 
-            TestResult::from_bool(q * b + r == a)
+            TestResult::from_bool(q * d + r == n)
         }
     }
 }