diff --git a/grc/CMakeLists.txt b/grc/CMakeLists.txt
index 2b94539..045d6a5 100644
--- a/grc/CMakeLists.txt
+++ b/grc/CMakeLists.txt
@@ -23,6 +23,7 @@
 add_subdirectory(receiver)
 add_subdirectory(flow_control)
 add_subdirectory(misc_utils)
+add_subdirectory(trx_interface)
 install(FILES
     gsm_block_tree.xml DESTINATION share/gnuradio/grc/blocks
 )