diff --git a/snark/src/lib.rs b/snark/src/lib.rs
index cf7d559..eac5acd 100644
--- a/snark/src/lib.rs
+++ b/snark/src/lib.rs
@@ -52,8 +52,14 @@ lazy_static! {
 
 /// This must be called before anything in this module is used.
 pub fn initialize() {
+    use std::mem::align_of;
     let mut l = INIT_LOCK.lock().unwrap();
 
+    assert_eq!(align_of::<Fr>(), align_of::<libc::uint64_t>());
+    assert_eq!(align_of::<G1>(), align_of::<libc::uint64_t>());
+    assert_eq!(align_of::<G2>(), align_of::<libc::uint64_t>());
+    assert_eq!(align_of::<Gt>(), align_of::<libc::uint64_t>());
+
     if !*l {
         unsafe { libsnarkwrap_init(); }
         *l = true;