diff --git a/lib/api/src/js/externals/memory.rs b/lib/api/src/js/externals/memory.rs
index 306379c1c..d7c9460d3 100644
--- a/lib/api/src/js/externals/memory.rs
+++ b/lib/api/src/js/externals/memory.rs
@@ -82,6 +82,9 @@ pub struct Memory {
     view: js_sys::Uint8Array,
 }
 
+unsafe impl Send for Memory {}
+unsafe impl Sync for Memory {}
+
 impl Memory {
     /// Creates a new host `Memory` from the provided [`MemoryType`].
     ///
@@ -234,8 +237,9 @@ impl Memory {
         Ok(Pages(new_pages))
     }
 
-    #[cfg(test)]
-    pub(crate) fn uint8view(&self) -> js_sys::Uint8Array {
+    /// Used by tests
+    #[doc(hidden)]
+    pub fn uint8view(&self) -> js_sys::Uint8Array {
         self.view.clone()
     }
 
diff --git a/lib/api/src/js/mem_access.rs b/lib/api/src/js/mem_access.rs
index 8a89a4d9c..98c98d2a2 100644
--- a/lib/api/src/js/mem_access.rs
+++ b/lib/api/src/js/mem_access.rs
@@ -1,10 +1,7 @@
 use crate::RuntimeError;
-use wasmer_types::ValueType;
-
 use crate::{Memory, Memory32, Memory64, WasmPtr};
 use std::{
     convert::TryInto,
-    error::Error,
     fmt,
     marker::PhantomData,
     mem::{self, MaybeUninit},
@@ -12,31 +9,24 @@ use std::{
     slice,
     string::FromUtf8Error,
 };
+use thiserror::Error;
+use wasmer_types::ValueType;
 
 /// Error for invalid [`Memory`] access.
-#[derive(Debug)]
+#[derive(Clone, Copy, Debug, Error)]
 #[non_exhaustive]
 pub enum MemoryAccessError {
     /// Memory access is outside heap bounds.
+    #[error("memory access out of bounds")]
     HeapOutOfBounds,
     /// Address calculation overflow.
+    #[error("address calculation overflow")]
     Overflow,
     /// String is not valid UTF-8.
+    #[error("string is not valid utf-8")]
     NonUtf8String,
 }
 
-impl fmt::Display for MemoryAccessError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            MemoryAccessError::HeapOutOfBounds => write!(f, "memory access out of bounds"),
-            MemoryAccessError::Overflow => write!(f, "address calculation overflow"),
-            MemoryAccessError::NonUtf8String => write!(f, "string is not valid utf-8"),
-        }
-    }
-}
-
-impl Error for MemoryAccessError {}
-
 impl From<MemoryAccessError> for RuntimeError {
     fn from(err: MemoryAccessError) -> Self {
         RuntimeError::new(err.to_string())
diff --git a/lib/api/src/sys/mem_access.rs b/lib/api/src/sys/mem_access.rs
index 8a89a4d9c..98c98d2a2 100644
--- a/lib/api/src/sys/mem_access.rs
+++ b/lib/api/src/sys/mem_access.rs
@@ -1,10 +1,7 @@
 use crate::RuntimeError;
-use wasmer_types::ValueType;
-
 use crate::{Memory, Memory32, Memory64, WasmPtr};
 use std::{
     convert::TryInto,
-    error::Error,
     fmt,
     marker::PhantomData,
     mem::{self, MaybeUninit},
@@ -12,31 +9,24 @@ use std::{
     slice,
     string::FromUtf8Error,
 };
+use thiserror::Error;
+use wasmer_types::ValueType;
 
 /// Error for invalid [`Memory`] access.
-#[derive(Debug)]
+#[derive(Clone, Copy, Debug, Error)]
 #[non_exhaustive]
 pub enum MemoryAccessError {
     /// Memory access is outside heap bounds.
+    #[error("memory access out of bounds")]
     HeapOutOfBounds,
     /// Address calculation overflow.
+    #[error("address calculation overflow")]
     Overflow,
     /// String is not valid UTF-8.
+    #[error("string is not valid utf-8")]
     NonUtf8String,
 }
 
-impl fmt::Display for MemoryAccessError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            MemoryAccessError::HeapOutOfBounds => write!(f, "memory access out of bounds"),
-            MemoryAccessError::Overflow => write!(f, "address calculation overflow"),
-            MemoryAccessError::NonUtf8String => write!(f, "string is not valid utf-8"),
-        }
-    }
-}
-
-impl Error for MemoryAccessError {}
-
 impl From<MemoryAccessError> for RuntimeError {
     fn from(err: MemoryAccessError) -> Self {
         RuntimeError::new(err.to_string())