diff --git a/include/alltypes.h.in b/include/alltypes.h.in
index 94aa2089..d9ff462e 100644
--- a/include/alltypes.h.in
+++ b/include/alltypes.h.in
@@ -1,5 +1,6 @@
 #define __LITTLE_ENDIAN 1234
 #define __BIG_ENDIAN 4321
+#define __USE_TIME_BITS64 1
 
 TYPEDEF unsigned _Addr size_t;
 TYPEDEF unsigned _Addr uintptr_t;