diff --git a/lib/models/ResultCode.ts b/lib/models/ResultCode.ts
index 8faa52f..129141f 100644
--- a/lib/models/ResultCode.ts
+++ b/lib/models/ResultCode.ts
@@ -1,3 +1,5 @@
+import {isLiteral} from '@6river/reason-guard';
+
 /**
  * 5/30/16
  * @author Joshua Chaitin-Pollak
@@ -11,6 +13,4 @@ export const resultCodes: {[K in ResultCode]: ResultCode} = {
 
 export type ResultCode = 'SUCCESS' | 'FAILURE' | 'RUNNING' | 'ERROR';
 
-export function isResultCode(res: any): res is ResultCode {
-	return Object.values(resultCodes).includes(res);
-}
+export const isResultCode = isLiteral(Object.values(resultCodes));
diff --git a/package-lock.json b/package-lock.json
index 377d44f..439304d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,12 @@
         "@commitlint/config-conventional": "^7.5.0"
       }
     },
+    "@6river/reason-guard": {
+      "version": "3.7.4",
+      "resolved": "https://registry.npmjs.org/@6river/reason-guard/-/reason-guard-3.7.4.tgz",
+      "integrity": "sha512-06+XoJuu2N82vk6BLCKt1G1IF9uEV6H6R658TUD8UjfF1BOjfnAuIaL0dgTcvCRgcN9sQrcTFASl24LsoYMUrQ==",
+      "dev": true
+    },
     "@babel/code-frame": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
diff --git a/package.json b/package.json
index 7e09813..d56f369 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
   "homepage": "https://github.com/6RiverSystems/blueshell#readme",
   "devDependencies": {
     "@6river/commitlint-config-6river": "2.1.0",
+    "@6river/reason-guard": "3.7.4",
     "@commitlint/cli": "8.3.4",
     "@types/archy": "0.0.31",
     "@types/chai": "4.1.7",