diff --git a/example/ex1/CMakeLists.txt b/example/ex1/CMakeLists.txt
index 8f8eca2f..2eb9064a 100644
--- a/example/ex1/CMakeLists.txt
+++ b/example/ex1/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_EXE xo_unit_ex1)
 set(SELF_SRCS ex1.cpp)
 
-add_executable(${SELF_EXE} ${SELF_SRCS})
-xo_include_options2(${SELF_EXE})
+xo_add_executable(${SELF_EXE} ${SELF_SRCS})
 
 # ----------------------------------------------------------------
 # dependencies..