diff --git a/lib/do_profile.js b/lib/do_profile.js
index 789f6df..437d4ab 100644
--- a/lib/do_profile.js
+++ b/lib/do_profile.js
@@ -394,9 +394,9 @@ function _addProfile(opts, cb) {
                     tilde(value, function (keyPath) {
                         fs.stat(keyPath, function (statErr, stats) {
                             if (statErr || !stats.isFile()) {
-                                return valCb(new Error(
+                                return valCb(new Error(format(
                                     '"%s" is neither a valid fingerprint, ' +
-                                    'nor an existing file', value));
+                                    'nor an existing file', value)));
                             }
                             fs.readFile(keyPath, function (readErr, keyData) {
                                 if (readErr) {