diff --git a/inc/post_code.hpp b/inc/post_code.hpp
index 98af300..498a0d8 100644
--- a/inc/post_code.hpp
+++ b/inc/post_code.hpp
@@ -14,6 +14,7 @@
 // limitations under the License.
 */
 #pragma once
+#include <config.h>
 #include <fcntl.h>
 #include <unistd.h>