diff --git a/thread/prioritizedworkqueue.cpp b/thread/prioritizedworkqueue.cpp
index 7f193fc407..ea54d35dac 100644
--- a/thread/prioritizedworkqueue.cpp
+++ b/thread/prioritizedworkqueue.cpp
@@ -1,5 +1,6 @@
 #include "base/functional.h"
 #include "base/logging.h"
+#include "base/timeutil.h"
 #include "thread/thread.h"
 #include "thread/prioritizedworkqueue.h"
 
@@ -66,6 +67,20 @@ PrioritizedWorkQueueItem *PrioritizedWorkQueue::Pop() {
 	}
 }
 
+void PrioritizedWorkQueue::Wait(PrioritizedWorkQueueItem *item) {
+	while (true) {
+		bool stillThere = false;
+		lock_guard guard(mutex_);
+		for (int i = 0; i < queue_.empty(); i++) {
+			if (queue_[i] == item)
+				stillThere = true;
+		}
+		if (!stillThere)
+			break;
+		sleep_ms(100);
+	}
+}
+
 // TODO: This feels ugly. Revisit later.
 
 static std::thread *workThread;
diff --git a/thread/prioritizedworkqueue.h b/thread/prioritizedworkqueue.h
index c2198a3d5b..506e3146b0 100644
--- a/thread/prioritizedworkqueue.h
+++ b/thread/prioritizedworkqueue.h
@@ -35,6 +35,9 @@ public:
 	bool Done() { return done_; }
 	void Stop();
 
+	// Try not to use this. It's a hack.
+	void Wait(PrioritizedWorkQueueItem *item);
+
 private:
 	bool done_;
 	recursive_mutex mutex_;
@@ -49,4 +52,4 @@ private:
 // Starts up a thread that keeps trying to run this workqueue.
 // TODO: This feels ugly. Revisit later.
 void ProcessWorkQueueOnThreadWhile(PrioritizedWorkQueue *wq);
-void StopProcessingWorkQueue(PrioritizedWorkQueue *wq);
\ No newline at end of file
+void StopProcessingWorkQueue(PrioritizedWorkQueue *wq);