diff --git a/llvm/docs/CMakeLists.txt b/llvm/docs/CMakeLists.txt
--- a/llvm/docs/CMakeLists.txt
+++ b/llvm/docs/CMakeLists.txt
@@ -148,7 +148,7 @@
     list(APPEND odoc_files -load ${odoc_file})
   endforeach()
 
-  add_custom_target(ocaml_doc
+  add_custom_target(ocaml_doc ALL
     COMMAND ${CMAKE_COMMAND} -E remove_directory ${CMAKE_CURRENT_BINARY_DIR}/ocamldoc/html
     COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/ocamldoc/html
     COMMAND ${OCAMLFIND} ocamldoc -d ${CMAKE_CURRENT_BINARY_DIR}/ocamldoc/html