diff --git a/jquery.validation/jquery.validation-tests.ts b/jquery.validation/jquery.validation-tests.ts
index cfb10489b..64fe6ef94 100644
--- a/jquery.validation/jquery.validation-tests.ts
+++ b/jquery.validation/jquery.validation-tests.ts
@@ -111,7 +111,7 @@ function test_validate() {
         submitHandler: function () { alert("Submitted!") }
     });
     $(".selector").validate({
-        showErrors: function (errorMap, errorList) {
+        showErrors: function (errorMap: ErrorDictionary, errorList: ErrorListItem[]) {
             $("#summary").html("Your form contains " + this.numberOfInvalids() + " errors, see details below.");
             this.defaultShowErrors();
         }
@@ -193,7 +193,7 @@ function test_methods() {
     validator.hideErrors();
     var isValid: boolean = validator.valid();
     var size: number = validator.size();
-    var errorMap: Object = validator.errorMap;
+    var errorMap: ErrorDictionary = validator.errorMap;
     var errorList: ErrorListItem[] = validator.errorList;
 
     $("#summary").text(validator.numberOfInvalids() + " field(s) are invalid");
diff --git a/jquery.validation/jquery.validation.d.ts b/jquery.validation/jquery.validation.d.ts
index afdbcea5d..301bf6bc6 100644
--- a/jquery.validation/jquery.validation.d.ts
+++ b/jquery.validation/jquery.validation.d.ts
@@ -28,7 +28,7 @@ interface ValidationOptions
 	onkeyup?: boolean;
 	onsubmit?: boolean;
 	rules?: Object;
-	showErrors?: (errorMap: Object, errorList: ErrorListItem[]) => void;
+   	showErrors?: (errorMap: ErrorDictionary, errorList: ErrorListItem[]) => void;
 	submitHandler?: (form: HTMLFormElement) => void;
 	success?: any;
 	unhighlight?: (element: HTMLElement, errorClass: string, validClass: string) => void;
@@ -36,6 +36,11 @@ interface ValidationOptions
 	wrapper?: string;
 }
 
+interface ErrorDictionary
+{
+	[name: string]: string;
+}
+
 interface ErrorListItem
 {
 	message: string;
@@ -59,7 +64,7 @@ interface Validator
 	valid(): boolean;
 	size(): number;
 
-	errorMap: Object;
+   	errorMap: ErrorDictionary;
 	errorList: ErrorListItem[];
 }