diff --git a/crates/wasmtime/src/runtime/vm/fibre/mod.rs b/crates/wasmtime/src/runtime/vm/fibre/mod.rs
index 1444aeb8ba46..40df54ee4b40 100644
--- a/crates/wasmtime/src/runtime/vm/fibre/mod.rs
+++ b/crates/wasmtime/src/runtime/vm/fibre/mod.rs
@@ -27,7 +27,7 @@ cfg_if::cfg_if! {
 
         impl FiberStack {
             /// Creates a new fiber stack of the given size.
-            pub fn new(size: usize) -> io::Result<Self> {
+            pub fn new(size: usize, _zeroed: bool /* TODO(dhil): unimplemented */) -> io::Result<Self> {
                 Ok(Self(imp::FiberStack::new(size)?))
             }
 
diff --git a/crates/wasmtime/src/runtime/vm/instance/allocator/wasmfx_allocator.rs b/crates/wasmtime/src/runtime/vm/instance/allocator/wasmfx_allocator.rs
index a3e681f08232..70f9969c2618 100644
--- a/crates/wasmtime/src/runtime/vm/instance/allocator/wasmfx_allocator.rs
+++ b/crates/wasmtime/src/runtime/vm/instance/allocator/wasmfx_allocator.rs
@@ -33,7 +33,7 @@ pub mod wasmfx_on_demand {
                     if #[cfg(all(feature = "unsafe_wasmfx_stacks", any(not(feature = "wasmfx_baseline"), feature = "wasmfx_no_baseline")))] {
                         super::FiberStack::malloc(self.stack_size)
                     } else {
-                        super::FiberStack::new(self.stack_size)
+                        super::FiberStack::new(self.stack_size, false /* whether zeroed */)
                     }
                 }
             };