diff --git a/src/auth/Pam.hpp b/src/auth/Pam.hpp
index 7e45586..831fbf2 100644
--- a/src/auth/Pam.hpp
+++ b/src/auth/Pam.hpp
@@ -7,6 +7,7 @@
 #include <mutex>
 #include <condition_variable>
 #include <functional>
+#include <thread>
 
 class CPam : public IAuthImplementation {
   public: