diff --git a/libstdc++/ChangeLog b/libstdc++/ChangeLog
index 2a222ce4446..33bf6d51081 100644
--- a/libstdc++/ChangeLog
+++ b/libstdc++/ChangeLog
@@ -1,3 +1,8 @@
+1999-11-19  Gabriel Dos Reis  <dosreis@cmla.ens-cachan.fr>
+
+	* std/valarray_meta.h (_DEFINE_EXPR_UNARY_FUNCTION): Don't forget
+	to define tanh. 
+
 Sun Nov 14 09:47:51 1999  H.J. Lu  <hjl@gnu.org>
 
 	* Makefile.in ($(OBJS)): Depend on stamp-picdir.
diff --git a/libstdc++/std/valarray_meta.h b/libstdc++/std/valarray_meta.h
index 0d6b09370e6..48fb21371f7 100644
--- a/libstdc++/std/valarray_meta.h
+++ b/libstdc++/std/valarray_meta.h
@@ -936,7 +936,8 @@ _Name(const valarray<_Tp>& __v)                                         \
     _DEFINE_EXPR_UNARY_FUNCTION(sin)
     _DEFINE_EXPR_UNARY_FUNCTION(asin)
     _DEFINE_EXPR_UNARY_FUNCTION(sinh)    
-    _DEFINE_EXPR_UNARY_FUNCTION(tan)    
+    _DEFINE_EXPR_UNARY_FUNCTION(tan)
+    _DEFINE_EXPR_UNARY_FUNCTION(tanh)
     _DEFINE_EXPR_UNARY_FUNCTION(atan)
     _DEFINE_EXPR_UNARY_FUNCTION(exp)    
     _DEFINE_EXPR_UNARY_FUNCTION(log)