diff --git a/types/simpl-schema/index.d.ts b/types/simpl-schema/index.d.ts
index 3ae568b855..2639b47009 100644
--- a/types/simpl-schema/index.d.ts
+++ b/types/simpl-schema/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: Andreas Richter <https://github.com/arichter83>
 //                 Qkramer <https://github.com/Qkramer>
 //                 Deskoh <https://github.com/deskoh>
+//                 Nicusor Chiciuc <https://github.com/nicu-chiciuc>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 export interface ValidationContext extends SimpleSchemaValidationContextStatic {
@@ -122,7 +123,8 @@ interface SimpleSchemaStatic {
   pick(...fields: string[]): SimpleSchemaStatic;
   omit(...fields: string[]): SimpleSchemaStatic;
   clean(doc: any, options?: CleanOption): any;
-  schema(key?: string): SchemaDefinition | SchemaDefinition[];
+  schema(key: string): SchemaDefinition;
+  schema(): SchemaDefinition[];
   getDefinition(key: string, propList?: any, functionContext?: any): any;
   keyIsInBlackBox(key: string): boolean;
   labels(labels: {[key: string]: string}): void;