diff --git a/src/encoding/armor.js b/src/encoding/armor.js
index f7031a49..dcbb6209 100644
--- a/src/encoding/armor.js
+++ b/src/encoding/armor.js
@@ -43,7 +43,7 @@ function getType(text) {
   var header = text.match(reHeader);
 
   if (!header) {
-    throw new Error('Unknow ASCII armor type');
+    throw new Error('Unknown ASCII armor type');
   }
 
   // BEGIN PGP MESSAGE, PART X/Y
diff --git a/test/general/armor.js b/test/general/armor.js
index a0a654e3..69ce787f 100644
--- a/test/general/armor.js
+++ b/test/general/armor.js
@@ -128,7 +128,7 @@ describe("ASCII armor", function() {
       '-----END PGP SIGNNATURE-----'].join('\n');
 
     msg = openpgp.cleartext.readArmored.bind(null, msg);
-    expect(msg).to.throw(Error, /Unknow ASCII armor type/);
+    expect(msg).to.throw(Error, /Unknown ASCII armor type/);
   });
 
   it('Armor checksum validation', function () {