diff --git a/p99/p99_clib.h b/p99/p99_clib.h
index ea275d042a5b6a3061b196b3c07fc4b74252189d..bc5a7047a635a8e3d043e999d76387edc010d787 100644
--- a/p99/p99_clib.h
+++ b/p99/p99_clib.h
@@ -16,6 +16,7 @@
 
 #include "p99_new.h"
 #include "p99_callback.h"
+#include "p99_tss.h"
 
 /**
  ** @addtogroup C11_library C11 additions to the C library