diff --git a/lib/api/src/js/externals/function.rs b/lib/api/src/js/externals/function.rs
index 4cece882026..f5ee117cef9 100644
--- a/lib/api/src/js/externals/function.rs
+++ b/lib/api/src/js/externals/function.rs
@@ -445,11 +445,10 @@ impl Function {
         Args: WasmTypeList,
         Rets: WasmTypeList,
     {
-        let vm_function = self.handle.get(store.as_store_ref().objects());
-
+        let ty = self.ty(store);
         // type check
         {
-            let expected = vm_function.ty.params();
+            let expected = ty.params();
             let given = Args::wasm_types();
 
             if expected != given {
@@ -462,7 +461,7 @@ impl Function {
         }
 
         {
-            let expected = vm_function.ty.results();
+            let expected = ty.results();
             let given = Rets::wasm_types();
 
             if expected != given {
diff --git a/lib/api/src/lib.rs b/lib/api/src/lib.rs
index 98b29b2fff1..6a4686033ff 100644
--- a/lib/api/src/lib.rs
+++ b/lib/api/src/lib.rs
@@ -54,7 +54,6 @@
 //!     "#;
 //!
 //!     let mut store = Store::default();
-//!     let env = FunctionEnv::new(&mut store, ());
 //!     let module = Module::new(&store, &module_wat)?;
 //!     // The module doesn't import anything, so we create an empty import object.
 //!     let import_object = imports! {};
diff --git a/lib/api/src/sys/externals/function.rs b/lib/api/src/sys/externals/function.rs
index aa6dcc9f9f8..c317b9648ca 100644
--- a/lib/api/src/sys/externals/function.rs
+++ b/lib/api/src/sys/externals/function.rs
@@ -530,11 +530,11 @@ impl Function {
         Args: WasmTypeList,
         Rets: WasmTypeList,
     {
-        let vm_function = self.handle.get(store.as_store_ref().objects());
+        let ty = self.ty(store);
 
         // type check
         {
-            let expected = vm_function.signature.params();
+            let expected = ty.params();
             let given = Args::wasm_types();
 
             if expected != given {
@@ -547,7 +547,7 @@ impl Function {
         }
 
         {
-            let expected = vm_function.signature.results();
+            let expected = ty.results();
             let given = Rets::wasm_types();
 
             if expected != given {