diff --git a/CHANGES b/CHANGES
index e54699b7ce..771d8b7694 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,10 @@
 
+3.2.0-dev.192 | 2020-02-28 11:36:12 -0800
+
+  * threading::Queue::WakeUp(): lock mutex before notifying condition_variable (Max Kellermann)
+
+    Not locking the associated mutex can create race conditions and lockups.
+
 3.2.0-dev.190 | 2020-02-28 00:42:17 -0800
 
   * Stmt: use class IntrusivePtr (Max Kellermann)
diff --git a/VERSION b/VERSION
index f3a3cc3bab..9abec97d07 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.2.0-dev.190
+3.2.0-dev.192
diff --git a/src/threading/Queue.h b/src/threading/Queue.h
index 4c3453d0c8..ad59f15268 100644
--- a/src/threading/Queue.h
+++ b/src/threading/Queue.h
@@ -255,7 +255,10 @@ template<typename T>
 inline void Queue<T>::WakeUp()
 	{
 	for ( int i = 0; i < NUM_QUEUES; i++ )
+		{
+		auto lock = acquire_lock(mutex[i]);
 		has_data[i].notify_all();
+		}
 	}
 
 }