diff --git a/starlark/src/environment/modules.rs b/starlark/src/environment/modules.rs
index 7fdc12c14..20c5a812e 100644
--- a/starlark/src/environment/modules.rs
+++ b/starlark/src/environment/modules.rs
@@ -418,6 +418,7 @@ impl Module {
             extra_value,
             heap_profile_on_freeze,
         } = self;
+        #[cfg(not(target_arch = "wasm32"))]
         let start = Instant::now();
         // This is when we do the GC/freeze, using the module slots as roots
         // Note that we even freeze anonymous slots, since they are accessed by
@@ -455,7 +456,10 @@ impl Module {
             heap: freezer.into_ref(),
             module: frozen_module_ref,
             extra_value,
+            #[cfg(not(target_arch = "wasm32"))]
             eval_duration: start.elapsed() + eval_duration.get(),
+            #[cfg(target_arch = "wasm32")]
+            eval_duration: eval_duration.get(),
         })
     }