diff --git a/src/doc/layer_io.cpp b/src/doc/layer_io.cpp
index c697e55be..099a4ec7f 100644
--- a/src/doc/layer_io.cpp
+++ b/src/doc/layer_io.cpp
@@ -35,8 +35,6 @@ using namespace base::serialization::little_endian;
 
 void write_layer(std::ostream& os, const Layer* layer)
 {
-  std::string name = layer->name();
-
   write32(os, layer->id());
   write_string(os, layer->name());