diff --git a/configure1.in b/configure1.in
index b87171f7955..bc5c3e8b3a3 100755
--- a/configure1.in
+++ b/configure1.in
@@ -1273,7 +1273,7 @@ AC_ALLOCA
 
 # logb and frexp are found in -lm on most systems.
 AC_HAVE_LIBRARY(-lm)
-AC_HAVE_FUNCS(gettimeofday gethostname dup2 rename closedir mkdir rmdir random bcopy logb frexp ftime res_init)
+AC_HAVE_FUNCS(gettimeofday gethostname dup2 rename closedir mkdir rmdir random bcopy logb frexp ftime res_init setsid)
 
 ok_so_far=true
 AC_FUNC_CHECK(socket, , ok_so_far=)