diff --git a/CMakeLists.txt b/CMakeLists.txt
index 60f3334..a620ba0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -199,7 +199,7 @@ install(TARGETS fxlibc DESTINATION lib/)
 install(DIRECTORY include/ DESTINATION include PATTERN "target" EXCLUDE)
 
 foreach(FOLDER IN LISTS TARGET_FOLDERS)
-  if(EXISTS include/target/${FOLDER}/)
+  if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/include/target/${FOLDER}")
     install(DIRECTORY include/target/${FOLDER}/ DESTINATION include)
   endif()
 endforeach()