diff --git a/packages/mongo-livedata/oplog_observe_driver.js b/packages/mongo-livedata/oplog_observe_driver.js
index 6f5411a272..9a4e5e9cc6 100644
--- a/packages/mongo-livedata/oplog_observe_driver.js
+++ b/packages/mongo-livedata/oplog_observe_driver.js
@@ -156,30 +156,29 @@ _.extend(OplogObserveDriver.prototype, {
       self._currentlyFetching = self._needToFetch;
       self._needToFetch = new LocalCollection._IdMap;
       var waiting = 0;
-      var error = null;
+      var anyError = null;
       var fut = new Future;
-      Fiber(function () {
-        self._currentlyFetching.forEach(function (cacheKey, id) {
-          // currentlyFetching will not be updated during this loop.
-          waiting++;
-          self._mongoHandle._docFetcher.fetch(
-            self._cursorDescription.collectionName, id, cacheKey,
-            function (err, doc) {
-              if (err) {
-                if (!error)
-                  error = err;
-              } else if (!self._stopped) {
-                self._handleDoc(id, doc);
-              }
-              waiting--;
-              if (waiting == 0)
-                fut.return();
-            });
-        });
-      }).run();
+      // This loop is safe, because _currentlyFetching will not be updated
+      // during this loop (in fact, it is never mutated).
+      self._currentlyFetching.forEach(function (cacheKey, id) {
+        waiting++;
+        self._mongoHandle._docFetcher.fetch(
+          self._cursorDescription.collectionName, id, cacheKey,
+          function (err, doc) {
+            if (err) {
+              if (!anyError)
+                anyError = err;
+            } else if (!self._stopped) {
+              self._handleDoc(id, doc);
+            }
+            waiting--;
+            if (waiting == 0)
+              fut.return();
+          });
+      });
       fut.wait();
-      if (error)
-        throw error;
+      if (anyError)
+        throw anyError;
       self._currentlyFetching = new LocalCollection._IdMap;
     }
     self._beSteady();