diff --git a/types/cypress-cucumber-preprocessor/index.d.ts b/types/cypress-cucumber-preprocessor/index.d.ts
index 605bed8812..f1a5f2cccc 100644
--- a/types/cypress-cucumber-preprocessor/index.d.ts
+++ b/types/cypress-cucumber-preprocessor/index.d.ts
@@ -1,6 +1,8 @@
 // Type definitions for cypress-cucumber-preprocessor 1.14
 // Project: https://github.com/TheBrainFamily/cypress-cucumber-preprocessor
-// Definitions by: Alec Brunelle <https://github.com/aleccool213>, Falcon Taylor-Carter <https://github.com/falconertc>
+// Definitions by: Alec Brunelle <https://github.com/aleccool213>
+//                 Falcon Taylor-Carter <https://github.com/falconertc>
+//                 Jens Peters <https://github.com/jp7677>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
diff --git a/types/cypress-cucumber-preprocessor/steps/index.d.ts b/types/cypress-cucumber-preprocessor/steps/index.d.ts
index d86c5354ea..fa339c001a 100644
--- a/types/cypress-cucumber-preprocessor/steps/index.d.ts
+++ b/types/cypress-cucumber-preprocessor/steps/index.d.ts
@@ -1,10 +1,19 @@
+export interface Transform {
+    regexp: RegExp;
+    transformer(...arg: string[]): any;
+    useForSnippets?: boolean;
+    preferForRegexpMatch?: boolean;
+    name?: string;
+    typeName?: string; // deprecated
+}
+
 export function given(expression: RegExp | string, implementation: (...args: any[]) => void): void;
 export function when(expression: RegExp | string, implementation: (...args: any[]) => void): void;
 export function then(expression: RegExp | string, implementation: (...args: any[]) => void): void;
 export function and(expression: RegExp | string, implementation: (...args: any[]) => void): void;
 export function but(expression: RegExp | string, implementation: (...args: any[]) => void): void;
 export function defineStep(expression: RegExp | string, implementation: (...args: any[]) => void): void;
-export function defineParameterType(): void;
+export function defineParameterType(parameterType: Transform): void;
 
 // Aliased versions of the above funcs.
 export function Given(expression: RegExp | string, implementation: (...args: any[]) => void): void;