diff --git a/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/mod.rs b/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/mod.rs
index e6916ae5dc..2a79852d21 100644
--- a/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/mod.rs
+++ b/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/mod.rs
@@ -29,7 +29,7 @@ impl Env {
         Env {
             prop: String::new(),
             opt_prop: None,
-            opt_map: Map::<String, Option<i32>>::new(),
+            opt_map: None,
         }
     }
 
diff --git a/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/serialization.rs b/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/serialization.rs
index 99c60d2f62..df2a91bc9c 100644
--- a/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/serialization.rs
+++ b/packages/test-cases/cases/bind/sanity/output/wasm-rs/env/serialization.rs
@@ -56,7 +56,7 @@ pub fn read_env<R: Read>(reader: &mut R) -> Result<Env, DecodeError> {
     let mut _prop: String = String::new();
     let mut _prop_set = false;
     let mut _opt_prop: Option<String> = None;
-    let mut _opt_map: Option<Map<String, Option<i32>>> = Map::<String, Option<i32>>::new();
+    let mut _opt_map: Option<Map<String, Option<i32>>> = None;
 
     while num_of_fields > 0 {
         num_of_fields -= 1;