diff --git a/types/aws-param-store/aws-param-store-tests.ts b/types/aws-param-store/aws-param-store-tests.ts
index 13ad6c0514..52266ba48a 100644
--- a/types/aws-param-store/aws-param-store-tests.ts
+++ b/types/aws-param-store/aws-param-store-tests.ts
@@ -65,8 +65,8 @@ promiseParamResult = getParameter(psName, options);
 promiseParamsResult = getParameters(psNames);
 promiseParamsResult = getParameters(psNames, options);
 
-promiseParamsByPathResult = getParametersByPath(psNames);
-promiseParamsByPathResult = getParametersByPath(psNames, options);
+promiseParamsByPathResult = getParametersByPath(psName);
+promiseParamsByPathResult = getParametersByPath(psName, options);
 
 paramResult = getParameterSync(psName);
 paramResult = getParameterSync(psName, options);
@@ -74,5 +74,5 @@ paramResult = getParameterSync(psName, options);
 paramsResult = getParametersSync(psNames);
 paramsResult = getParametersSync(psNames, options);
 
-paramsByPathResult = getParametersByPathSync(psNames);
-paramsByPathResult = getParametersByPathSync(psNames, options);
+paramsByPathResult = getParametersByPathSync(psName);
+paramsByPathResult = getParametersByPathSync(psName, options);
diff --git a/types/aws-param-store/index.d.ts b/types/aws-param-store/index.d.ts
index c35edef688..2dbbfdd164 100644
--- a/types/aws-param-store/index.d.ts
+++ b/types/aws-param-store/index.d.ts
@@ -1,6 +1,6 @@
 // Type definitions for aws-param-store 2.1
 // Project: https://github.com/vandium-io/aws-param-store#readme
-// Definitions by: Jason Gray <https://github.com/jasonthomasgray>
+// Definitions by: Jason Gray <https://github.com/jasonthomasgray>, Nathan Oertel <https://github.com/nathanoertel>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
@@ -27,12 +27,12 @@ export function getParametersSync(
 ): SSM.Types.GetParametersResult;
 
 export function getParametersByPath(
-    path: SSM.Types.ParameterNameList,
+    path: SSM.Types.PSParameterName,
     options?: SSM.Types.ClientConfiguration
 ): Promise<SSM.Types.ParameterList>;
 
 export function getParametersByPathSync(
-    path: SSM.Types.ParameterNameList,
+    path: SSM.Types.PSParameterName,
     options?: SSM.Types.ClientConfiguration
 ): SSM.Types.ParameterList;