diff --git a/CMakeLists.txt b/CMakeLists.txt
index 996ca4448cd34024ee9f0ff5ca1006e2be3dc517..4fdb2fd1657cfbd70267c2e7bd7b8b8faf0a5731 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,7 @@ include( "src/nett-python/_SourceFiles.cmake" )
 
 include_directories (${ZMQ_INCLUDE_DIR})
 include_directories (${NETT_INCLUDE_DIR})
+include_directories (${NETT_SCHEMA_DIR})
 include_directories (${BOOST_INCLUDE_DIR})
 include_directories (${PYTHON_INCLUDE_DIR})
 include_directories (${PROTOBUF_INCLUDE_DIR})