diff --git a/types/iopipe__iopipe/index.d.ts b/types/iopipe__iopipe/index.d.ts
index 591501c5aa..42a68f7015 100644
--- a/types/iopipe__iopipe/index.d.ts
+++ b/types/iopipe__iopipe/index.d.ts
@@ -3,22 +3,26 @@
 // Definitions by: Javon Harper <https://github.com/javonharper>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-export interface LibraryConfig {
+interface LibraryConfig {
     debug?: boolean;
     token?: string;
     networkTimeout?: number;
     timeoutWindow?: number;
 }
 
-export type FunctionWrapper = (handler: any) => void;
+type FunctionWrapper = (handler: any) => void;
 
-export function label(label: string): void;
+declare function iopipe(config?: LibraryConfig): FunctionWrapper;
 
-export function metric(label: string, value: number): void;
+declare namespace iopipe {
+    function label(label: string): void;
 
-export namespace mark {
-    function start(label: string): void;
-    function end(label: string): void;
+    function metric(label: string, value: number): void;
+
+    namespace mark {
+        function start(label: string): void;
+        function end(label: string): void;
+    }
 }
 
-export default function iopipe(config?: LibraryConfig): FunctionWrapper;
+export = iopipe;
diff --git a/types/iopipe__iopipe/iopipe__iopipe-tests.ts b/types/iopipe__iopipe/iopipe__iopipe-tests.ts
index a48dfe7416..8f5b9bae29 100644
--- a/types/iopipe__iopipe/iopipe__iopipe-tests.ts
+++ b/types/iopipe__iopipe/iopipe__iopipe-tests.ts
@@ -1,6 +1,6 @@
-import iopipe, { label, metric, mark, LibraryConfig } from "iopipe__iopipe";
+import iopipe, { label, metric, mark } from "iopipe__iopipe";
 
-const config: LibraryConfig = {
+const config = {
   token: "ABCDEFG"
 };
 
diff --git a/types/iopipe__iopipe/tsconfig.json b/types/iopipe__iopipe/tsconfig.json
index f0770af65c..eaab1ac3c6 100644
--- a/types/iopipe__iopipe/tsconfig.json
+++ b/types/iopipe__iopipe/tsconfig.json
@@ -8,7 +8,7 @@
         "noImplicitThis": true,
         "strictNullChecks": true,
         "strictFunctionTypes": true,
-        "esModuleInterop": true,
+        "allowSyntheticDefaultImports": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"