diff --git a/types/ts-nameof/index.d.ts b/types/ts-nameof/index.d.ts
index a7850d695f..1a4daec3dd 100644
--- a/types/ts-nameof/index.d.ts
+++ b/types/ts-nameof/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for ts-nameof 3.2
+// Type definitions for ts-nameof 4.0
 // Project: https://github.com/dsherret/ts-nameof#readme
 // Definitions by: David Sherret <https://github.com/dsherret>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -15,4 +15,5 @@ declare namespace nameof {
     // tslint:disable-next-line no-unnecessary-generics
     function toArray<T>(func: (obj: T) => any[]): string[];
     function toArray(...args: any[]): string[];
+    function interpolate<T>(value: T): T;
 }
diff --git a/types/ts-nameof/ts-nameof-tests.ts b/types/ts-nameof/ts-nameof-tests.ts
index 21a53ec0f5..0b7878b3cd 100644
--- a/types/ts-nameof/ts-nameof-tests.ts
+++ b/types/ts-nameof/ts-nameof-tests.ts
@@ -29,6 +29,9 @@ nameof.toArray(testInstance.prop1); // $ExpectType string[]
 nameof.toArray(testInstance.prop1, testInstance.prop2); // $ExpectType string[]
 nameof.toArray<TestClass>(t => [t.prop1]); // $ExpectType string[]
 
+// nameof.interpolate tests
+nameof.interpolate("" as string); // $ExpectType string
+
 // reference type test
 const myObj = { test: "" };
 nameof(myObj); // $ExpectType string