diff --git a/gpu/src/dawn_impl.zig b/gpu/src/dawn_impl.zig
index 586b29b4..742fdb4c 100644
--- a/gpu/src/dawn_impl.zig
+++ b/gpu/src/dawn_impl.zig
@@ -21,9 +21,10 @@ pub const Interface = gpu.Interface(struct {
     }
 
     pub inline fn getProcAddress(device: *gpu.Device, proc_name: [*:0]const u8) ?gpu.Proc {
-        _ = device;
-        _ = proc_name;
-        unreachable;
+        return procs.getProcAddress.?(
+            @ptrCast(c.WGPUDevice, device),
+            proc_name,
+        );
     }
 
     pub inline fn adapterCreateDevice(adapter: *gpu.Adapter, descriptor: ?*const gpu.Device.Descriptor) ?*gpu.Device {
diff --git a/gpu/src/main.zig b/gpu/src/main.zig
index decbd247..d7761e1d 100644
--- a/gpu/src/main.zig
+++ b/gpu/src/main.zig
@@ -50,8 +50,8 @@ const device = @import("device.zig");
 const interface = @import("interface.zig");
 
 /// Generic function pointer type, used for returning API function pointers. Must be
-/// cast to a `fn (...) callconv(.C) T` before use.
-pub const Proc = *anyopaque;
+/// cast to the right `fn (...) callconv(.C) T` type before use.
+pub const Proc = fn () callconv(.C) void;
 
 pub const ComputePassTimestampWrite = extern struct {
     query_set: *query_set.QuerySet,