diff --git a/libraries/chain/CMakeLists.txt b/libraries/chain/CMakeLists.txt
index 56e588a3..c7dd5375 100644
--- a/libraries/chain/CMakeLists.txt
+++ b/libraries/chain/CMakeLists.txt
@@ -122,8 +122,6 @@ add_library( graphene_chain
 
              sidechain_address_evaluator.cpp
 
-             sidechain_address_evaluator.cpp
-
              ${HEADERS}
              ${PROTOCOL_HEADERS}
              "${CMAKE_CURRENT_BINARY_DIR}/include/graphene/chain/hardfork.hpp"