diff --git a/shared/static/wasm/sx-platform.js b/shared/static/wasm/sx-platform.js
index 1b873404..40bebf8c 100644
--- a/shared/static/wasm/sx-platform.js
+++ b/shared/static/wasm/sx-platform.js
@@ -89,10 +89,17 @@
     window._driveAsync = function driveAsync(result) {
       if (!result || !result.suspended) return;
       var req = result.request;
-      var items = req && (req.items || req);
-      var op = items && items[0];
-      var opName = typeof op === "string" ? op : (op && op.name) || String(op);
-      var arg = items && items[1];
+      // Request can be dict {op, args} or list (op-name arg ...)
+      var opName, arg;
+      if (req && req._type === "dict" && req.op) {
+        opName = req.op;
+        arg = req.args && req.args.items ? req.args.items[0] : null;
+      } else {
+        var items = req && (req.items || req);
+        var op = items && items[0];
+        opName = typeof op === "string" ? op : (op && op.name) || String(op);
+        arg = items && items[1];
+      }
       if (opName === "io-sleep" || opName === "wait") {
         setTimeout(function() {
           try { driveAsync(result.resume(null)); } catch(e) { console.error("[sx] driveAsync:", e.message); }