diff --git a/Threads/Inc/threads_signal.hpp b/Threads/Inc/threads_signal.hpp
index ee76fb5..3364af9 100644
--- a/Threads/Inc/threads_signal.hpp
+++ b/Threads/Inc/threads_signal.hpp
@@ -8,7 +8,10 @@
 #ifndef THREADS_INC_THREADS_SIGNAL_HPP_
 #define THREADS_INC_THREADS_SIGNAL_HPP_
 
+#include <type_traits>
+
 #include <freertos_os2.h>
+#include <threads_primitivethread.hpp>
 
 namespace Threads
 {