diff --git a/rust/test/shared/simple_nested_test.rs b/rust/test/shared/simple_nested_test.rs
index d0f218a829..4a26e58c33 100644
--- a/rust/test/shared/simple_nested_test.rs
+++ b/rust/test/shared/simple_nested_test.rs
@@ -73,7 +73,7 @@ fn test_nested_muts() {
 }
 
     let mut outer_msg = Outer::new();
-    let inner_msg: InnerMut<'_> = outer_msg.inner_mut();
+    let mut inner_msg: InnerMut<'_> = outer_msg.inner_mut();
     assert_that!(
         inner_msg,
         matches_pattern!(InnerMut{
diff --git a/src/google/protobuf/compiler/rust/message.cc b/src/google/protobuf/compiler/rust/message.cc
index 2e9e217483..4affd948cd 100644
--- a/src/google/protobuf/compiler/rust/message.cc
+++ b/src/google/protobuf/compiler/rust/message.cc
@@ -304,7 +304,7 @@ void GetterForViewOrMut(Context& ctx, const FieldDescriptor& field,
                // TODO: check mutational pathway genn'd correctly
                if (is_mut) {
                  ctx.Emit({}, R"rs(
-                  pub fn r#$field$_mut(&self) -> $pb$::Mut<'_, $RsType$> {
+                  pub fn r#$field$_mut(&mut self) -> $pb$::Mut<'_, $RsType$> {
                     static VTABLE: $pbi$::$vtable$$optional_type_args$ =
                       $pbi$::$vtable$::new(
                         $pbi$::Private,