diff --git a/paddle/fluid/CMakeLists.txt b/paddle/fluid/CMakeLists.txt
index 6e3411f7a2861ea050ebe09de14abd054ca2bb12..519a00fb073b08f6c88de8186de187476b548fd3 100644
--- a/paddle/fluid/CMakeLists.txt
+++ b/paddle/fluid/CMakeLists.txt
@@ -14,4 +14,4 @@ if(WITH_INFERENCE)
   add_subdirectory(inference)
 endif()
 
-#add_subdirectory(train)
+add_subdirectory(train)