diff --git a/src/image.js b/src/image.js
index 4e403ca12..5f14868b7 100644
--- a/src/image.js
+++ b/src/image.js
@@ -126,6 +126,7 @@ var PDFImage = (function PDFImageClosure() {
 
     if (smask) {
       handleImageData(handler, xref, res, smask, smaskPromise);
+      maskPromise.resolve(null);
     } else {
       smaskPromise.resolve(null);
       if (mask && isStream(mask)) {