diff --git a/share/openbr/cmake/FindAlphanum.cmake b/share/openbr/cmake/FindAlphanum.cmake
index 8c58ae1..64b2efa 100644
--- a/share/openbr/cmake/FindAlphanum.cmake
+++ b/share/openbr/cmake/FindAlphanum.cmake
@@ -1,2 +1,3 @@
 find_path(ALPHANUM_DIR alphanum.hpp ${CMAKE_SOURCE_DIR}/3rdparty/*)
+mark_as_advanced(ALPHANUM_DIR)
 include_directories(${ALPHANUM_DIR})