diff --git a/lib/c-api/src/wasm_c_api/externals/function.rs b/lib/c-api/src/wasm_c_api/externals/function.rs
index 40e8da26144..b219ec7372c 100644
--- a/lib/c-api/src/wasm_c_api/externals/function.rs
+++ b/lib/c-api/src/wasm_c_api/externals/function.rs
@@ -1,4 +1,3 @@
-use super::super::function_env::wasmer_funcenv_ref_mut_t;
 use super::super::store::wasm_store_t;
 use super::super::trap::wasm_trap_t;
 use super::super::types::{wasm_functype_t, wasm_valkind_enum};
@@ -26,7 +25,7 @@ impl wasm_func_t {
 
 #[allow(non_camel_case_types)]
 pub type wasm_func_callback_t = unsafe extern "C" fn(
-    context: &mut wasmer_funcenv_ref_mut_t,
+    context: &mut (),
     args: &wasm_val_vec_t,
     results: &mut wasm_val_vec_t,
 ) -> Option<Box<wasm_trap_t>>;
@@ -39,7 +38,8 @@ pub unsafe extern "C" fn wasm_func_new(
 ) -> Option<Box<wasm_func_t>> {
     let function_type = function_type?;
     let callback = callback?;
-    let mut store = store?.store.store_mut();
+    let store = store?;
+    let mut store_mut = store.store.store_mut();
 
     let func_sig = &function_type.inner().function_type;
     let num_rets = func_sig.results().len();
@@ -61,7 +61,7 @@ pub unsafe extern "C" fn wasm_func_new(
             ]
             .into();
 
-            let trap = callback(ctx.data_mut().data, &processed_args, &mut results);
+            let trap = callback(ctx.data_mut(), &processed_args, &mut results);
 
             if let Some(trap) = trap {
                 return Err(trap.inner);
@@ -77,13 +77,13 @@ pub unsafe extern "C" fn wasm_func_new(
             Ok(processed_results)
         };
     let function = Function::new(
-        &mut store,
-        &FunctionEnv::new(&mut store, ()),
+        &mut store_mut,
+        &FunctionEnv::new(&mut store_mut, ()),
         func_sig,
         inner_callback,
     );
     Some(Box::new(wasm_func_t {
-        extern_: wasm_extern_t::new(store.clone(), function.into()),
+        extern_: wasm_extern_t::new(store.store.clone(), function.into()),
     }))
 }
 
diff --git a/lib/c-api/src/wasm_c_api/externals/global.rs b/lib/c-api/src/wasm_c_api/externals/global.rs
index 2ca23a32e3d..4b6e94f69c2 100644
--- a/lib/c-api/src/wasm_c_api/externals/global.rs
+++ b/lib/c-api/src/wasm_c_api/externals/global.rs
@@ -28,18 +28,19 @@ pub unsafe extern "C" fn wasm_global_new(
     val: Option<&wasm_val_t>,
 ) -> Option<Box<wasm_global_t>> {
     let global_type = global_type?;
-    let mut store = store?.store.store_mut();
+    let store = store?;
+    let mut store_mut = store.store.store_mut();
     let val = val?;
 
     let global_type = &global_type.inner().global_type;
     let wasm_val = val.try_into().ok()?;
     let global = if global_type.mutability.is_mutable() {
-        Global::new_mut(&mut store, wasm_val)
+        Global::new_mut(&mut store_mut, wasm_val)
     } else {
-        Global::new(&mut store, wasm_val)
+        Global::new(&mut store_mut, wasm_val)
     };
     Some(Box::new(wasm_global_t {
-        extern_: wasm_extern_t::new(store, global.into()),
+        extern_: wasm_extern_t::new(store.store.clone(), global.into()),
     }))
 }
 
@@ -73,7 +74,7 @@ pub unsafe extern "C" fn wasm_global_set(global: &mut wasm_global_t, val: &wasm_
     c_try!(global
         .extern_
         .global()
-        .set(&mut global.extern_.store.store_mut(), value));
+        .set(&mut global.extern_.store.store_mut(), value); otherwise ());
 }
 
 #[no_mangle]
diff --git a/lib/c-api/src/wasm_c_api/externals/memory.rs b/lib/c-api/src/wasm_c_api/externals/memory.rs
index 47ad79ca5ac..de9a49c4bc6 100644
--- a/lib/c-api/src/wasm_c_api/externals/memory.rs
+++ b/lib/c-api/src/wasm_c_api/externals/memory.rs
@@ -24,7 +24,8 @@ pub unsafe extern "C" fn wasm_memory_new(
     memory_type: Option<&wasm_memorytype_t>,
 ) -> Option<Box<wasm_memory_t>> {
     let memory_type = memory_type?;
-    let mut store_mut = store?.store.store_mut();
+    let store = store?;
+    let mut store_mut = store.store.store_mut();
     let memory_type = memory_type.inner().memory_type;
     let memory = c_try!(Memory::new(&mut store_mut, memory_type));
     Some(Box::new(wasm_memory_t {
diff --git a/lib/c-api/src/wasm_c_api/instance.rs b/lib/c-api/src/wasm_c_api/instance.rs
index 6750c2d5325..ac0c2c086e7 100644
--- a/lib/c-api/src/wasm_c_api/instance.rs
+++ b/lib/c-api/src/wasm_c_api/instance.rs
@@ -195,7 +195,7 @@ pub unsafe extern "C" fn wasm_instance_exports(
     let mut extern_vec: Vec<Option<Box<wasm_extern_t>>> = instance
         .exports
         .iter()
-        .map(|(_name, r#extern)| Some(Box::new(r#extern.clone().into())))
+        .map(|(_name, r#extern)| Some(Box::new(wasm_extern_t::new(original_instance.store.clone(), #extern.clone().into()))))
         .collect();
     out.set_buffer(extern_vec);
 }
diff --git a/lib/c-api/src/wasm_c_api/module.rs b/lib/c-api/src/wasm_c_api/module.rs
index 56138ae38d5..5c765ab5b77 100644
--- a/lib/c-api/src/wasm_c_api/module.rs
+++ b/lib/c-api/src/wasm_c_api/module.rs
@@ -102,7 +102,7 @@ pub unsafe extern "C" fn wasm_module_validate(
 
     Module::validate(&mut store, bytes.as_slice())
         .map(|_| true)
-        .unwrap_or(false);
+        .unwrap_or(false)
 }
 
 /// Returns an array of the exported types in the module.
@@ -474,7 +474,7 @@ pub unsafe extern "C" fn wasm_module_deserialize(
 /// See [`wasm_module_deserialize`].
 #[no_mangle]
 pub unsafe extern "C" fn wasm_module_serialize(module: &wasm_module_t, out: &mut wasm_byte_vec_t) {
-    let byte_vec = c_try!(module.inner.serialize());
+    let byte_vec = c_try!(module.inner.serialize(); otherwise ());
     out.set_buffer(byte_vec);
 }
 
diff --git a/lib/c-api/src/wasm_c_api/unstable/wasi.rs b/lib/c-api/src/wasm_c_api/unstable/wasi.rs
index 7010058b984..7c772f92465 100644
--- a/lib/c-api/src/wasm_c_api/unstable/wasi.rs
+++ b/lib/c-api/src/wasm_c_api/unstable/wasi.rs
@@ -161,14 +161,15 @@ fn wasi_get_unordered_imports_inner(
     wasi_env: Option<&wasi_env_t>,
     imports: &mut wasmer_named_extern_vec_t,
 ) -> Option<()> {
-    let mut store = store?.store.store_mut();
+    let store = store?;
+    let mut store_mut = store.store.store_mut();
     let module = module?;
     let _wasi_env = wasi_env?;
 
     let version = c_try!(get_wasi_version(&module.inner, false)
         .ok_or("could not detect a WASI version on the given module"));
 
-    let import_object = generate_import_object_from_env(&mut store, version);
+    let import_object = generate_import_object_from_env(&mut store_mut, version);
 
     imports.set_buffer(
         import_object
@@ -176,12 +177,12 @@ fn wasi_get_unordered_imports_inner(
             .map(|((module, name), extern_)| {
                 let module = module.into();
                 let name = name.into();
-                let extern_inner = Extern::from_vm_extern(&mut store, extern_.to_vm_extern());
+                let extern_inner = Extern::from_vm_extern(&mut store_mut, extern_.to_vm_extern());
 
                 Some(Box::new(wasmer_named_extern_t {
                     module,
                     name,
-                    r#extern: Box::new(extern_inner.into()),
+                    r#extern: Box::new(wasm_extern_t::new(store.store.clone(), extern_inner.clone())),
                 }))
             })
             .collect::<Vec<_>>(),
diff --git a/lib/c-api/src/wasm_c_api/value.rs b/lib/c-api/src/wasm_c_api/value.rs
index 1d56c39f6f1..130bb9782dd 100644
--- a/lib/c-api/src/wasm_c_api/value.rs
+++ b/lib/c-api/src/wasm_c_api/value.rs
@@ -153,7 +153,7 @@ pub unsafe extern "C" fn wasm_val_copy(
             wasm_valkind_enum::WASM_ANYREF => wasm_val_inner { wref: val.of.wref },
             wasm_valkind_enum::WASM_FUNCREF => wasm_val_inner { wref: val.of.wref },
         }
-    }));
+    }); otherwise ());
 }
 
 #[no_mangle]
diff --git a/lib/c-api/src/wasm_c_api/wasi/mod.rs b/lib/c-api/src/wasm_c_api/wasi/mod.rs
index 3b65b78b5a5..6c72b5158cd 100644
--- a/lib/c-api/src/wasm_c_api/wasi/mod.rs
+++ b/lib/c-api/src/wasm_c_api/wasi/mod.rs
@@ -332,7 +332,7 @@ fn wasi_get_imports_inner(
     module: Option<&wasm_module_t>,
     imports: &mut wasm_extern_vec_t,
 ) -> Option<()> {
-    let store = store?;
+    let mut store = store?;
     let mut store_mut = store.store.store_mut();
     let module = module?;