diff --git a/citeproc-wrapper.js b/citeproc-wrapper.js
index 76f2d94..435b2d8 100644
--- a/citeproc-wrapper.js
+++ b/citeproc-wrapper.js
@@ -7,11 +7,13 @@ function Citeproc (citations, styleLocation, localeLocation, done) {
     this.construct = function () {
         var self = this;
 
-        self.loadStyle(styleLocation, function () {
-            self.loadLocale(localeLocation, function () {
+        self.loadStyle(styleLocation, function (err) {
+            if (err) return done(err);
+            self.loadLocale(localeLocation, function (err) {
+                if (err) return done(err);
                 self.setupSys();
                 citeproc = new CSL.Engine(sys, style);
-                done(citeproc);
+                done(null, citeproc);
             });
         });
     }
diff --git a/test/test.js b/test/test.js
index 3b63adb..70942bb 100644
--- a/test/test.js
+++ b/test/test.js
@@ -10,11 +10,11 @@ describe('citeproc-js', function () {
         var style  = './styles/chicago-fullnote-bibliography.csl';
         var locale = './locales/locales-nb-NO.xml';
 
-        var cite = new Citeproc(citations, style, locale, function (citeproc) {
+        var cite = new Citeproc(citations, style, locale, function (err, citeproc) {
             citeproc.updateItems(Object.keys(citations));
             var bibliography = citeproc.makeBibliography();
             console.log(bibliography);
-            done();
+            done(err);
         });
     });
 });