diff --git a/SHSTKMacros.cmake b/SHSTKMacros.cmake
index d0f5386..a2954dc 100644
--- a/SHSTKMacros.cmake
+++ b/SHSTKMacros.cmake
@@ -229,7 +229,7 @@ macro(shstk_add_directories domain)
 			add_subdirectory(${_d})
 		endif()
 	endforeach()
-	shstk_copy_to_parent("")
+	shstk_copy_to_parent()
 endmacro()