diff --git a/types/node-getopt/index.d.ts b/types/node-getopt/index.d.ts
index 304f09bd4c..afd0a89adf 100644
--- a/types/node-getopt/index.d.ts
+++ b/types/node-getopt/index.d.ts
@@ -8,8 +8,8 @@
  */
 
 
-interface StringMap {
-    [index: string]: string;
+interface OptionMap {
+    [index: string]: string | string[] | boolean;
 }
 
 /**
@@ -17,14 +17,14 @@ interface StringMap {
  */
 declare class ParsedOption {
     public argv: string[];
-    public options: StringMap;
+    public options: OptionMap;
 
-    constructor(argv: string[], options: StringMap);
+    constructor(argv: string[], options: OptionMap);
     public empty(): boolean;
 }
 
 interface EventCallback {
-    (args: string[], options: StringMap): void;
+    (args: string[], options: OptionMap): void;
 }
 
 interface ErrorFunc {