diff --git a/modules/video_coding/codecs/vp9/svc_config.cc b/modules/video_coding/codecs/vp9/svc_config.cc
index e5d88bc..b73661c 100644
--- a/modules/video_coding/codecs/vp9/svc_config.cc
+++ b/modules/video_coding/codecs/vp9/svc_config.cc
@@ -79,6 +79,11 @@
   // First active layer must be configured.
   num_spatial_layers = std::max(num_spatial_layers, first_active_layer + 1);
 
+  // Ensure top layer is even enough.
+  int required_divisiblity = 1 << num_spatial_layers;
+  input_width = input_width - input_width % required_divisiblity;
+  input_height = input_height - input_height % required_divisiblity;
+
   for (size_t sl_idx = first_active_layer; sl_idx < num_spatial_layers;
        ++sl_idx) {
     SpatialLayer spatial_layer = {0};
diff --git a/modules/video_coding/video_codec_initializer.cc b/modules/video_coding/video_codec_initializer.cc
index e8665b9..8671df7 100644
--- a/modules/video_coding/video_codec_initializer.cc
+++ b/modules/video_coding/video_codec_initializer.cc
@@ -219,6 +219,14 @@
         video_codec.spatialLayers[i] = spatial_layers[i];
       }
 
+      // The top spatial layer dimensions may not be equal to the input
+      // resolution because of the rounding or explicit configuration.
+      // This difference must be propagated to the stream configuration.
+      video_codec.width = spatial_layers.back().width;
+      video_codec.height = spatial_layers.back().height;
+      video_codec.simulcastStream[0].width = spatial_layers.back().width;
+      video_codec.simulcastStream[0].height = spatial_layers.back().height;
+
       // Update layering settings.
       video_codec.VP9()->numberOfSpatialLayers =
           static_cast<unsigned char>(spatial_layers.size());