diff --git a/dist/index.js b/dist/index.js
index 083415a..c395f84 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -87,7 +87,7 @@ var translateVerifierResult = function translateVerifierResult(result) {
   }
 
   if (result === 1) {
-    return "k";
+    return "K";
   }
 
   return (11 - result).toString();
diff --git a/src/index.js b/src/index.js
index eba7d9b..f0fb695 100644
--- a/src/index.js
+++ b/src/index.js
@@ -67,7 +67,7 @@ export const translateVerifierResult = (result) => {
   }
 
   if (result === 1){
-    return "k";
+    return "K";
   }
 
   return (11 - result).toString();
diff --git a/test/index.test.js b/test/index.test.js
index 96812f1..92dd792 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -54,6 +54,7 @@ test("validRut", () => {
     expect(validRut("12.148.514-1")).toBe(true);
     expect(validRut("23379.716-2")).toBe(true);
     expect(validRut("329382508")).toBe(true);
+    expect(validRut("18531474-k")).toBe(true);
     expect(validRut("36128619-0")).toBe(false);
 });