diff --git a/background/update.js b/background/update.js
index 8426035e..b6c665b9 100644
--- a/background/update.js
+++ b/background/update.js
@@ -145,24 +145,27 @@ global API_METHODS
 
     function maybeUpdateUsercss() {
       // TODO: when sourceCode is > 100kB use http range request(s) for version check
-      return download(style.updateUrl).then(text => {
-        const json = usercss.buildMeta(text);
-        const {usercssData: {version}} = style;
-        const {usercssData: {version: newVersion}} = json;
-        switch (Math.sign(semverCompare(version, newVersion))) {
-          case 0:
-            // re-install is invalid in a soft upgrade
-            if (!ignoreDigest) {
-              const sameCode = text === style.sourceCode;
-              return Promise.reject(sameCode ? STATES.SAME_CODE : STATES.SAME_VERSION);
-            }
-            break;
-          case 1:
-            // downgrade is always invalid
-            return Promise.reject(STATES.ERROR_VERSION);
-        }
-        return usercss.buildCode(json);
-      });
+      return download(style.updateUrl)
+        .then(text =>
+          usercss.buildMeta(text)
+            .then(json => {
+              const {usercssData: {version}} = style;
+              const {usercssData: {version: newVersion}} = json;
+              switch (Math.sign(semverCompare(version, newVersion))) {
+                case 0:
+                  // re-install is invalid in a soft upgrade
+                  if (!ignoreDigest) {
+                    const sameCode = text === style.sourceCode;
+                    return Promise.reject(sameCode ? STATES.SAME_CODE : STATES.SAME_VERSION);
+                  }
+                  break;
+                case 1:
+                  // downgrade is always invalid
+                  return Promise.reject(STATES.ERROR_VERSION);
+              }
+              return usercss.buildCode(json);
+            })
+        );
     }
 
     function maybeSave(json = {}) {