diff --git a/src/libcoretest/num/int_macros.rs b/src/libcoretest/num/int_macros.rs
index fa41167cae8a6..cb2359873e9dc 100644
--- a/src/libcoretest/num/int_macros.rs
+++ b/src/libcoretest/num/int_macros.rs
@@ -86,9 +86,9 @@ mod tests {
 
     #[test]
     fn test_count_zeros() {
-        assert!(A.count_zeros() == BITS - 3);
-        assert!(B.count_zeros() == BITS - 2);
-        assert!(C.count_zeros() == BITS - 5);
+        assert!(A.count_zeros() == BITS as u32 - 3);
+        assert!(B.count_zeros() == BITS as u32 - 2);
+        assert!(C.count_zeros() == BITS as u32 - 5);
     }
 
     #[test]
diff --git a/src/libcoretest/num/uint_macros.rs b/src/libcoretest/num/uint_macros.rs
index 39e41a4fad3b7..57a44f5082006 100644
--- a/src/libcoretest/num/uint_macros.rs
+++ b/src/libcoretest/num/uint_macros.rs
@@ -54,9 +54,9 @@ mod tests {
 
     #[test]
     fn test_count_zeros() {
-        assert!(A.count_zeros() == BITS - 3);
-        assert!(B.count_zeros() == BITS - 2);
-        assert!(C.count_zeros() == BITS - 5);
+        assert!(A.count_zeros() == BITS as u32 - 3);
+        assert!(B.count_zeros() == BITS as u32 - 2);
+        assert!(C.count_zeros() == BITS as u32 - 5);
     }
 
     #[test]