diff --git a/crates/wasi/src/preview2/ctx.rs b/crates/wasi/src/preview2/ctx.rs
index 03b69da3b795..68d690d80c19 100644
--- a/crates/wasi/src/preview2/ctx.rs
+++ b/crates/wasi/src/preview2/ctx.rs
@@ -54,7 +54,9 @@ impl WasiCtxBuilder {
     pub fn new() -> Self {
         // For the insecure random API, use `SmallRng`, which is fast. It's
         // also insecure, but that's the deal here.
-        let insecure_random = Box::new(cap_rand::rngs::SmallRng::from_entropy());
+        let insecure_random = Box::new(cap_rand::rngs::SmallRng::from_rng(cap_rand::thread_rng(
+            cap_rand::ambient_authority(),
+        )).unwrap());
 
         // For the insecure random seed, use a `u128` generated from
         // `thread_rng()`, so that it's not guessable from the insecure_random