diff --git a/include/YapInterface.h b/include/YapInterface.h
index f4bb46c3d..8d7706efe 100755
--- a/include/YapInterface.h
+++ b/include/YapInterface.h
@@ -616,6 +616,10 @@ extern X_API int      PROTO(YAP_RequiresExtraStack,(size_t));
 extern X_API int
 YAP_parse_yap_arguments(int argc, char *argv[], YAP_init_args *iap);
 
+extern X_API YAP_Int      YAP_AtomToInt(YAP_Atom At);
+
+extern X_API YAP_Atom     YAP_IntToAtom(YAP_Int i);
+
 #define YAP_InitCPred(N,A,F)  YAP_UserCPredicate(N,F,A)
 
 __END_DECLS