diff --git a/gpu/src/dawn_impl.zig b/gpu/src/dawn_impl.zig
index fd167cec..9cf2f1ee 100644
--- a/gpu/src/dawn_impl.zig
+++ b/gpu/src/dawn_impl.zig
@@ -125,8 +125,7 @@ pub const Interface = gpu.Interface(struct {
     }
 
     pub inline fn bufferGetSize(buffer: *gpu.Buffer) u64 {
-        _ = buffer;
-        unreachable;
+        return procs.bufferGetSize.?(@ptrCast(c.WGPUBuffer, buffer));
     }
 
     pub inline fn bufferGetUsage(buffer: *gpu.Buffer) gpu.Buffer.UsageFlags {