diff --git a/src/TRPC/importTRPCServer.ts b/src/TRPC/importTRPCServer.ts
index 6377caa..43db62b 100644
--- a/src/TRPC/importTRPCServer.ts
+++ b/src/TRPC/importTRPCServer.ts
@@ -2,7 +2,10 @@ import { Effect } from "effect"
 import { ImportError } from "../ImportError"
 
 
-export const importTRPCServer = Effect.tryPromise({
+export const importTRPCServer: Effect.Effect<
+    typeof import("@trpc/server"),
+    ImportError
+> = Effect.tryPromise({
     try: () => import("@trpc/server"),
     catch: cause => new ImportError({ path: "@trpc/server", cause }),
 })