diff --git a/dep/ACE_wrappers/m4/aio.m4 b/dep/ACE_wrappers/m4/aio.m4
index b38a8b981a..49fa7d19af 100644
--- a/dep/ACE_wrappers/m4/aio.m4
+++ b/dep/ACE_wrappers/m4/aio.m4
@@ -64,7 +64,6 @@ if test "$ace_has_aio_funcs" = yes; then
 #include <string.h>
 #include <errno.h>
 #include <stdio.h>
-#include <iostream.h>
 
 #include <aio.h>