diff --git a/Changelog.md b/Changelog.md
index 7240e397..440f26dd 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -31,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `descriptor_count()` setter on `ash::vk::WriteDescriptorSet` (#809)
 - Added `*_as_c_str()` getters for `c_char` pointers and `c_char` arrays (#831)
 - Added `#[must_use]` to Vulkan structs to make it more clear that they are moved by the builder pattern (#845)
+- Added `load_with()` function on `Device` and `Instance` for providing custom `get_xxx_proc_addr()` implementations (#846)
 - Added `Send`/`Sync` to all Vulkan structs (#869)
 
 ### Changed
diff --git a/ash/src/device.rs b/ash/src/device.rs
index f35788a6..ae21dab0 100644
--- a/ash/src/device.rs
+++ b/ash/src/device.rs
@@ -2,8 +2,8 @@
 use crate::prelude::*;
 use crate::vk;
 use crate::RawPtr;
+use core::ffi;
 use std::mem;
-use std::os::raw::c_void;
 use std::ptr;
 
 /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkDevice.html>
@@ -19,16 +19,24 @@ pub struct Device {
 
 impl Device {
     pub unsafe fn load(instance_fn: &vk::InstanceFnV1_0, device: vk::Device) -> Self {
-        let load_fn = |name: &std::ffi::CStr| {
-            mem::transmute((instance_fn.get_device_proc_addr)(device, name.as_ptr()))
-        };
+        Self::load_with(
+            |name: &std::ffi::CStr| {
+                mem::transmute((instance_fn.get_device_proc_addr)(device, name.as_ptr()))
+            },
+            device,
+        )
+    }
 
+    pub unsafe fn load_with(
+        mut load_fn: impl FnMut(&ffi::CStr) -> *const ffi::c_void,
+        device: vk::Device,
+    ) -> Self {
         Self::from_parts_1_3(
             device,
-            vk::DeviceFnV1_0::load(load_fn),
-            vk::DeviceFnV1_1::load(load_fn),
-            vk::DeviceFnV1_2::load(load_fn),
-            vk::DeviceFnV1_3::load(load_fn),
+            vk::DeviceFnV1_0::load(&mut load_fn),
+            vk::DeviceFnV1_1::load(&mut load_fn),
+            vk::DeviceFnV1_2::load(&mut load_fn),
+            vk::DeviceFnV1_3::load(&mut load_fn),
         )
     }
 
@@ -951,7 +959,7 @@ impl Device {
         &self,
         descriptor_set: vk::DescriptorSet,
         descriptor_update_template: vk::DescriptorUpdateTemplate,
-        data: *const c_void,
+        data: *const ffi::c_void,
     ) {
         (self.device_fn_1_1.update_descriptor_set_with_template)(
             self.handle(),
@@ -2273,7 +2281,7 @@ impl Device {
         offset: vk::DeviceSize,
         size: vk::DeviceSize,
         flags: vk::MemoryMapFlags,
-    ) -> VkResult<*mut c_void> {
+    ) -> VkResult<*mut ffi::c_void> {
         let mut data = mem::MaybeUninit::uninit();
         (self.device_fn_1_0.map_memory)(
             self.handle(),
diff --git a/ash/src/instance.rs b/ash/src/instance.rs
index abb5c572..a4aca79d 100644
--- a/ash/src/instance.rs
+++ b/ash/src/instance.rs
@@ -4,8 +4,8 @@ use crate::device::Device;
 use crate::prelude::*;
 use crate::vk;
 use crate::RawPtr;
+use core::ffi;
 use std::mem;
-use std::os::raw::c_char;
 use std::ptr;
 
 /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkInstance.html>
@@ -20,15 +20,21 @@ pub struct Instance {
 
 impl Instance {
     pub unsafe fn load(static_fn: &vk::StaticFn, instance: vk::Instance) -> Self {
-        let load_fn = |name: &std::ffi::CStr| {
-            mem::transmute((static_fn.get_instance_proc_addr)(instance, name.as_ptr()))
-        };
+        Self::load_with(
+            |name| mem::transmute((static_fn.get_instance_proc_addr)(instance, name.as_ptr())),
+            instance,
+        )
+    }
 
+    pub unsafe fn load_with(
+        mut load_fn: impl FnMut(&ffi::CStr) -> *const ffi::c_void,
+        instance: vk::Instance,
+    ) -> Self {
         Self::from_parts_1_3(
             instance,
-            vk::InstanceFnV1_0::load(load_fn),
-            vk::InstanceFnV1_1::load(load_fn),
-            vk::InstanceFnV1_3::load(load_fn),
+            vk::InstanceFnV1_0::load(&mut load_fn),
+            vk::InstanceFnV1_1::load(&mut load_fn),
+            vk::InstanceFnV1_3::load(&mut load_fn),
         )
     }
 
@@ -374,7 +380,7 @@ impl Instance {
     pub unsafe fn get_device_proc_addr(
         &self,
         device: vk::Device,
-        p_name: *const c_char,
+        p_name: *const ffi::c_char,
     ) -> vk::PFN_vkVoidFunction {
         (self.instance_fn_1_0.get_device_proc_addr)(device, p_name)
     }