diff --git a/Libraries/external/baselib/Include/Cpp/Time.h b/Libraries/external/baselib/Include/Cpp/Time.h
index 48fcea4..ab2e47d 100644
--- a/Libraries/external/baselib/Include/Cpp/Time.h
+++ b/Libraries/external/baselib/Include/Cpp/Time.h
@@ -2,6 +2,7 @@
 
 #include "../C/Baselib_Timer.h"
 #include <chrono>
+#include <ratio>
 #include <cmath>
 
 namespace baselib