diff --git a/lib/c-api/src/wasm_c_api/macros.rs b/lib/c-api/src/wasm_c_api/macros.rs
index 0231205e3..afa81957d 100644
--- a/lib/c-api/src/wasm_c_api/macros.rs
+++ b/lib/c-api/src/wasm_c_api/macros.rs
@@ -131,12 +131,14 @@ macro_rules! wasm_declare_boxed_vec {
 
             // TODO: do this properly
             impl [<wasm_ $name _vec_t>] {
-                pub unsafe fn into_slice(&self) -> Option<&[*mut [<wasm_ $name _t>]]>{
+                pub unsafe fn into_slice(&self) -> Option<&[Box<[<wasm_ $name _t>]>]>{
                     if self.data.is_null() {
                         return None;
                     }
 
-                    Some(::std::slice::from_raw_parts(self.data, self.size))
+                    let slice: &[*mut [<wasm_ $name _t>]] = ::std::slice::from_raw_parts(self.data, self.size);
+                    let slice: &[Box<[<wasm_ $name _t>]>] = ::std::mem::transmute(slice);
+                    Some(slice)
                 }
             }
 
diff --git a/lib/c-api/src/wasm_c_api/module.rs b/lib/c-api/src/wasm_c_api/module.rs
index 206d97382..627f932e4 100644
--- a/lib/c-api/src/wasm_c_api/module.rs
+++ b/lib/c-api/src/wasm_c_api/module.rs
@@ -3,7 +3,6 @@ use super::types::{
     wasm_byte_vec_t, wasm_exporttype_t, wasm_exporttype_vec_t, wasm_importtype_t,
     wasm_importtype_vec_t,
 };
-use std::mem;
 use std::ptr::NonNull;
 use std::slice;
 use std::sync::Arc;
diff --git a/lib/c-api/src/wasm_c_api/types/function.rs b/lib/c-api/src/wasm_c_api/types/function.rs
index 699e86a66..7e95a39a2 100644
--- a/lib/c-api/src/wasm_c_api/types/function.rs
+++ b/lib/c-api/src/wasm_c_api/types/function.rs
@@ -42,13 +42,13 @@ unsafe fn wasm_functype_new_inner(
     let params: Vec<ValType> = params
         .into_slice()?
         .iter()
-        .map(|&ptr| *ptr)
+        .map(|ptr| **ptr)
         .map(Into::into)
         .collect::<Vec<_>>();
     let results: Vec<ValType> = results
         .into_slice()?
         .iter()
-        .map(|&ptr| *ptr)
+        .map(|ptr| **ptr)
         .map(Into::into)
         .collect::<Vec<_>>();