diff --git a/types/nssm/index.d.ts b/types/nssm/index.d.ts
index c1bc88bdf1..e181e6fc6e 100644
--- a/types/nssm/index.d.ts
+++ b/types/nssm/index.d.ts
@@ -44,14 +44,16 @@ type NssmCommandFn =
     & TwoArgCommandFn
     & PromiseCommandFn;
 
-type Nssm = {
-    [key in Command]: NssmCommandFn
-};
-
-interface NssmOptions {
-    nssmExe?: string;
-}
-
-declare function nssm(serviceName: string, options?: NssmOptions): Nssm;
-
 export = nssm;
+
+declare function nssm(serviceName: string, options?: nssm.NssmOptions): nssm.Nssm;
+
+declare namespace nssm {
+    type Nssm = {
+        [key in Command]: NssmCommandFn
+    };
+
+    interface NssmOptions {
+        nssmExe?: string;
+    }
+}
diff --git a/types/nssm/nssm-tests.ts b/types/nssm/nssm-tests.ts
index c0ace009c6..ceabc27e51 100644
--- a/types/nssm/nssm-tests.ts
+++ b/types/nssm/nssm-tests.ts
@@ -3,7 +3,7 @@
 import nssm = require('nssm');
 
 const svcName = 'test';
-const options = { nssmExe: 'nssm.exe' };
+const options: nssm.NssmOptions = { nssmExe: 'nssm.exe' };
 const testService = nssm(svcName, options);
 
 const propertyName = 'Start';