diff --git a/convict/convict-tests.ts b/convict/convict-tests.ts
index 3bd64c5929..56326c00b3 100644
--- a/convict/convict-tests.ts
+++ b/convict/convict-tests.ts
@@ -104,7 +104,7 @@ conf.loadFile(['./configs/always.json', './configs/sometimes.json']);
 
 // perform validation
 
-conf.validate();
+conf.validate({ strict: true });
 
 var port: number = conf.default('port');
 
diff --git a/convict/convict.d.ts b/convict/convict.d.ts
index 05323de269..07bf5940ff 100644
--- a/convict/convict.d.ts
+++ b/convict/convict.d.ts
@@ -41,7 +41,7 @@ declare module "convict" {
             load(conf: Object): void;
             loadFile(file: string): void;
             loadFile(files: string[]): void;
-            validate(): void;
+            validate(options?: { strict?: boolean }): void;
             /**
              * Exports all the properties (that is the keys and their current values) as a {JSON} {Object}
              * @returns {Object} A {JSON} compliant {Object}