diff --git a/src/video_engine/vie_channel_manager.cc b/src/video_engine/vie_channel_manager.cc
index 777bcccc29..3fbaff8c9d 100644
--- a/src/video_engine/vie_channel_manager.cc
+++ b/src/video_engine/vie_channel_manager.cc
@@ -206,6 +206,8 @@ int ViEChannelManager::DeleteChannel(int channel_id) {
 
     // Check if other channels are using the same encoder.
     if (ChannelUsingViEEncoder(channel_id)) {
+      // Not supported.
+      assert(false);
       vie_encoder = NULL;
     } else {
       // Delete later when we've released the critsect.