diff --git a/include/parser/platform_headers/linux_parser.hpp b/include/parser/platform_headers/linux_parser.hpp
index 61d3d0f..38e741d 100644
--- a/include/parser/platform_headers/linux_parser.hpp
+++ b/include/parser/platform_headers/linux_parser.hpp
@@ -2,6 +2,7 @@
 
 #ifdef __linux__
 #ifndef LINUX_PARSER_HPP
+#define LINUX_PARSER_HPP
 #include <fstream>
 #include <string>