diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09923a3..71ae77d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,8 +16,9 @@ endif ()
 add_subdirectory(dependencies/libcsptr/ EXCLUDE_FROM_ALL)
 add_subdirectory(dependencies/dyncall/ EXCLUDE_FROM_ALL)
 
+include_directories(SYSTEM /usr/local/include)
+
 include_directories(
-  /usr/local/include/
   dependencies/libcsptr/include/
   dependencies/dyncall/dyncall/
   dependencies/valgrind/include/