diff --git a/starlark/src/values/layout/heap/heap_type.rs b/starlark/src/values/layout/heap/heap_type.rs
index 0d70c4846..c7c8ffaf9 100644
--- a/starlark/src/values/layout/heap/heap_type.rs
+++ b/starlark/src/values/layout/heap/heap_type.rs
@@ -893,7 +893,7 @@ impl<'v> Tracer<'v> {
     /// Helper function to annotate that this field has been considered for tracing,
     /// but is not relevant because it has a static lifetime containing no relevant values.
     /// Does nothing.
-    pub fn trace_static<T: 'static>(&self, value: &mut T) {
+    pub fn trace_static<T: 'static>(&self, value: &T) {
         // Nothing to do because T can't contain the lifetime 'v
         let _ = value;
     }