diff --git a/packages/server/src/context.ts b/packages/server/src/context.ts
index 69fa71eb..7bdb83a7 100644
--- a/packages/server/src/context.ts
+++ b/packages/server/src/context.ts
@@ -2,8 +2,6 @@ import type { IsNever } from '@orpc/shared'
 
 export type Context = Record<string, any>
 
-export type TypeInitialContext<T extends Context> = (type: T) => unknown
-
 export type MergedContext<T extends Context, U extends Context> = T & U
 
 export function mergeContext<T extends Context, U extends Context>(
diff --git a/packages/server/src/middleware-decorated.test.ts b/packages/server/src/middleware-decorated.test.ts
index 00c5f483..0b3b43e6 100644
--- a/packages/server/src/middleware-decorated.test.ts
+++ b/packages/server/src/middleware-decorated.test.ts
@@ -36,21 +36,25 @@ describe('decorateMiddleware', () => {
 
     const decorated = decorateMiddleware((options, input, output) => {
       fn(options, input, output)
-      return options.next({ context: { auth: true } })
+      return options.next({ context: { auth: 1, mid1: true } })
     }).concat((options, input, output) => {
       fn2(options, input, output)
-      return options.next({})
+      return options.next({ context: { auth: 2, mid2: true } })
     }) as any
 
     next.mockReturnValueOnce('__mocked__')
     const outputFn = vi.fn()
-    expect((await decorated({ next }, 'input', outputFn))).toBe('__mocked__')
+    const signal = AbortSignal.timeout(100)
+    expect((await decorated({ next, context: { origin: true }, signal }, 'input', outputFn))).toBe('__mocked__')
 
     expect(fn).toHaveBeenCalledTimes(1)
-    expect(fn).toHaveBeenCalledWith({ next: expect.any(Function) }, 'input', outputFn)
+    expect(fn).toHaveBeenCalledWith({ next: expect.any(Function), context: { origin: true }, signal }, 'input', outputFn)
 
     expect(fn2).toHaveBeenCalledTimes(1)
-    expect(fn2).toHaveBeenCalledWith({ next, context: { auth: true } }, 'input', outputFn)
+    expect(fn2).toHaveBeenCalledWith({ next: expect.any(Function), context: { origin: true, auth: 1, mid1: true }, signal }, 'input', outputFn)
+
+    expect(next).toHaveBeenCalledTimes(1)
+    expect(next).toHaveBeenCalledWith({ context: { auth: 2, mid2: true, mid1: true } })
   })
 
   it('can concat with map input', async () => {
@@ -80,6 +84,9 @@ describe('decorateMiddleware', () => {
     expect(map).toHaveBeenCalledWith('input')
 
     expect(fn2).toHaveBeenCalledTimes(1)
-    expect(fn2).toHaveBeenCalledWith({ context: { auth: true }, next }, { name: 'input' }, outputFn)
+    expect(fn2).toHaveBeenCalledWith({ context: { auth: true }, next: expect.any(Function) }, { name: 'input' }, outputFn)
+
+    expect(next).toHaveBeenCalledTimes(1)
+    expect(next).toHaveBeenCalledWith({ context: { auth: true } })
   })
 })
diff --git a/packages/server/src/middleware-decorated.ts b/packages/server/src/middleware-decorated.ts
index 51b63866..13d67642 100644
--- a/packages/server/src/middleware-decorated.ts
+++ b/packages/server/src/middleware-decorated.ts
@@ -1,6 +1,6 @@
 import type { Meta, ORPCErrorConstructorMap } from '@orpc/contract'
 import type { Context, MergedContext } from './context'
-import type { AnyMiddleware, MapInputMiddleware, Middleware, MiddlewareNextFn } from './middleware'
+import type { AnyMiddleware, MapInputMiddleware, Middleware } from './middleware'
 
 export interface DecoratedMiddleware<
   TInContext extends Context,
@@ -82,11 +82,14 @@ export function decorateMiddleware<
       : concatMiddleware
 
     const concatted = decorateMiddleware((options, input, output, ...rest) => {
-      const next: MiddlewareNextFn<any, any> = async (...[nextOptions]) => {
-        return mapped({ ...options, context: { ...nextOptions?.context, ...options.context } }, input, output, ...rest)
-      }
-
-      const merged = middleware({ ...options, next } as any, input as any, output as any, ...rest)
+      const merged = middleware({
+        ...options,
+        next: (...[nextOptions1]: [any]) => mapped({
+          ...options,
+          context: { ...options.context, ...nextOptions1?.context },
+          next: (...[nextOptions2]) => options.next({ context: { ...nextOptions1?.context, ...nextOptions2?.context } }) as any,
+        }, input, output, ...rest),
+      } as any, input as any, output as any, ...rest)
 
       return merged
     })
diff --git a/packages/server/src/procedure.ts b/packages/server/src/procedure.ts
index 626d592a..a1284bd5 100644
--- a/packages/server/src/procedure.ts
+++ b/packages/server/src/procedure.ts
@@ -1,6 +1,6 @@
 import type { ContractProcedureDef, ErrorMap, Meta, ORPCErrorConstructorMap, Schema, SchemaInput, SchemaOutput } from '@orpc/contract'
 import type { Promisable } from '@orpc/shared'
-import type { Context, TypeInitialContext } from './context'
+import type { Context } from './context'
 import type { AnyMiddleware } from './middleware'
 import { isContractProcedure } from '@orpc/contract'
 
@@ -41,7 +41,7 @@ export interface ProcedureDef<
   TErrorMap extends ErrorMap,
   TMeta extends Meta,
 > extends ContractProcedureDef<TInputSchema, TOutputSchema, TErrorMap, TMeta> {
-  __initialContext?: TypeInitialContext<TInitialContext>
+  __initialContext?: (type: TInitialContext) => unknown
   middlewares: AnyMiddleware[]
   inputValidationIndex: number
   outputValidationIndex: number