diff --git a/tests/rdrand.rs b/tests/rdrand.rs
index 4ff85c47..25678683 100644
--- a/tests/rdrand.rs
+++ b/tests/rdrand.rs
@@ -11,5 +11,10 @@ mod rdrand;
 #[path = "../src/util.rs"]
 mod util;
 
-use rdrand::getrandom_inner as getrandom_impl;
+// The rdrand implementation has the signature of getrandom_uninit(), but our
+// tests expect getrandom_impl() to have the signature of getrandom().
+fn getrandom_impl(dest: &mut [u8]) -> Result<(), Error> {
+    rdrand::getrandom_inner(unsafe { util::slice_as_uninit_mut(dest) })?;
+    Ok(())
+}
 mod common;