diff --git a/angular-formly/angular-formly.d.ts b/angular-formly/angular-formly.d.ts
index 3dff7cd8a..423e6ff9b 100644
--- a/angular-formly/angular-formly.d.ts
+++ b/angular-formly/angular-formly.d.ts
@@ -101,13 +101,13 @@ declare module AngularFormly {
 		type?: string;
 
 		//expression types
-		onBlur?: string | IExpresssionFunction;
-		onChange?: string | IExpresssionFunction;
-		onClick?: string | IExpresssionFunction;
-		onFocus?: string | IExpresssionFunction;
-		onKeydown?: string | IExpresssionFunction;
-		onKeypress?: string | IExpresssionFunction;
-		onKeyup?: string | IExpresssionFunction;
+		onBlur?: string | IExpressionFunction;
+		onChange?: string | IExpressionFunction;
+		onClick?: string | IExpressionFunction;
+		onFocus?: string | IExpressionFunction;
+		onKeydown?: string | IExpressionFunction;
+		onKeypress?: string | IExpressionFunction;
+		onKeyup?: string | IExpressionFunction;
 
 		//Bootstrap types
 		label?: string;