diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index d143f4e65..f4690176d 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -6494,11 +6494,22 @@ declare module _ {
     }
 
     type PH = LoDashStatic;
-    type Function0<R> = () => R;
-    type Function1<T1, R> = (t1: T1) => R;
-    type Function2<T1, T2, R> = (t1: T1, t2: T2) => R;
-    type Function3<T1, T2, T3, R> = (t1: T1, t2: T2, t3: T3) => R;
-    type Function4<T1, T2, T3, T4, R> = (t1: T1, t2: T2, t3: T3, t4: T4) => R;
+
+    interface Function0<R> {
+        (): R;
+    }
+    interface Function1<T1, R> {
+        (t1: T1): R;
+    }
+    interface Function2<T1, T2, R> {
+        (t1: T1, t2: T2): R;
+    }
+    interface Function3<T1, T2, T3, R> {
+        (t1: T1, t2: T2, t3: T3): R;
+    }
+    interface Function4<T1, T2, T3, T4, R> {
+        (t1: T1, t2: T2, t3: T3, t4: T4): R;
+    }
 
     interface Partial {
         // arity 0