diff --git a/otsdaq-mu2e-tracker/CMakeLists.txt b/otsdaq-mu2e-tracker/CMakeLists.txt
index c6f3b9a..6a5eabb 100644
--- a/otsdaq-mu2e-tracker/CMakeLists.txt
+++ b/otsdaq-mu2e-tracker/CMakeLists.txt
@@ -1,4 +1,4 @@
-# add_subdirectory(FEInterfaces)
+add_subdirectory(FEInterfaces)
 add_subdirectory(Generators)
 add_subdirectory(ArtModules)
 add_subdirectory(Ui)