1 files changed, 4 insertions, 2 deletions
diff --git a/lib/main.js b/lib/main.js
index 9cc8196..8d5828d 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -14,7 +14,7 @@ function main(argv) {
     var outputFormat = argv.output_format;
     var styleMapPath = argv.style_map;
 
-    readStyleMap(styleMapPath).then(function(styleMap) {
+    var result = readStyleMap(styleMapPath).then(function(styleMap) {
         var options = {
             styleMap: styleMap,
             outputFormat: outputFormat
@@ -49,7 +49,9 @@ function main(argv) {
 
                 outputStream.write(result.value);
             });
-    }).done();
+    });
+
+    promises.toExternalPromise(result).done();
 }
 
 function readStyleMap(styleMapPath) {